When I moved a couple villagers to a new village and reloaded the save, the villagers returned to the previous coordinates they had when I first loaded the save. This issue doesn't always occur, and as far as I can tell, it only affects villagers.

Update 2/13/2019, version 19w07a: While playing some more, I noticed that when reloading the world, the villagers actually load up elsewhere than just their previous location. Loading up the world the second time had a villager load at least 48 blocks away from it's last position and outside the enclosed area. Loading the world a 3rd time saw the villager load back in it's original position within the village enclosure. Loading it a 4th time once again saw it load outside the enclosure.

Logs from initial posting from version 19w05a

Here is a section of the logs displaying what I think is the issue:
[12:22:54] [Client thread/WARN]: Ambiguity between arguments [teleport, destination] and [teleport, targets] with inputs: [Player, 0123, @e, dd12be42-52a9-4a91-a8a1-11c01849e498]
[12:22:54] [Client thread/WARN]: Ambiguity between arguments [teleport, location] and [teleport, destination] with inputs: [0.1 -0.5 .9, 0 0 0]
[12:22:54] [Client thread/WARN]: Ambiguity between arguments [teleport, location] and [teleport, targets] with inputs: [0.1 -0.5 .9, 0 0 0]
[12:22:54] [Client thread/WARN]: Ambiguity between arguments [teleport, targets] and [teleport, destination] with inputs: [Player, 0123, dd12be42-52a9-4a91-a8a1-11c01849e498]
[12:22:54] [Client thread/WARN]: Ambiguity between arguments [teleport, targets, location] and [teleport, targets, destination] with inputs: [0.1 -0.5 .9, 0 0 0]
[12:22:54] [Client thread/INFO]: Loaded 6 recipes
[12:22:54] [Client thread/INFO]: Loaded 0 advancements
[12:22:54] [Server thread/INFO]: Starting integrated minecraft server version 19w05a
[12:22:54] [Server thread/INFO]: Generating keypair
[12:22:54] [Server thread/INFO]: Reloading ResourceManager: Default
[12:22:55] [Server thread/INFO]: Loaded 6 recipes
[12:22:56] [Server thread/INFO]: Loaded 799 advancements
[12:22:56] [Server thread/INFO]: Preparing start region for dimension minecraft:overworld
[12:22:57] [Client thread/INFO]: Preparing spawn area
[12:22:57] [Client thread/INFO]: Preparing spawn area
[12:22:57] [Client thread/INFO]: Preparing spawn area
[12:22:58] [Client thread/INFO]: Preparing spawn area
[12:22:58] [Client thread/INFO]: Preparing spawn area
[12:22:59] [Client thread/INFO]: Preparing spawn area
[12:22:59] [Client thread/INFO]: Preparing spawn area
[12:23:00] [Client thread/INFO]: Preparing spawn area
[12:23:00] [Client thread/INFO]: Preparing spawn area
[12:23:01] [Client thread/INFO]: Preparing spawn area
[12:23:01] [Client thread/INFO]: Preparing spawn area
[12:23:02] [Client thread/INFO]: Preparing spawn area
[12:23:02] [Client thread/INFO]: Preparing spawn area
[12:23:03] [Client thread/INFO]: Preparing spawn area
[12:23:04] [Client thread/INFO]: Time elapsed: 7211 ms
[12:23:04] [Server thread/INFO]: Changing view distance to 14, from 10
[12:23:05] [Server thread/INFO]: MarcoLiondor[local:E:63c473ee] logged in with entity id 9 at (-516.6794682787199, 65.0, -859.2571283519924)
[12:23:05] [Server thread/INFO]: MarcoLiondor has joined the game
[12:23:08] [Server thread/WARN]: Keeping entity minecraft:sheep that already exists with UUID ceb3c359-60fc-42e5-a102-b68eee409b5a
[12:23:08] [Server thread/WARN]: Can't keep up! Is the server overloaded? Running 3846ms or 76 ticks behind
[12:23:08] [Client thread/INFO]: Loaded 478 advancements
[12:23:09] [Server thread/WARN]: Keeping entity minecraft:villager that already exists with UUID de2059db-940b-4b6d-878d-066eeb2d0e51
[12:23:09] [Server thread/WARN]: Keeping entity minecraft:villager that already exists with UUID 6968209a-8c7b-4762-95e2-93837a350599
[12:23:09] [Server thread/WARN]: Keeping entity minecraft:villager that already exists with UUID de2059db-940b-4b6d-878d-066eeb2d0e51
[12:23:09] [Server thread/WARN]: Keeping entity minecraft:villager that already exists with UUID 6968209a-8c7b-4762-95e2-93837a350599
[12:23:15] [Server thread/WARN]: Keeping entity minecraft:sheep that already exists with UUID 5786e16a-dde2-46ac-bf30-ff110663b5ce
[12:23:15] [Server thread/WARN]: Keeping entity minecraft:sheep that already exists with UUID 61702cdc-7067-469d-be88-6575cd03864d
[12:23:20] [Server thread/WARN]: Keeping entity minecraft:chicken that already exists with UUID 1f2e426a-cfad-411d-9b54-a639bad0c1fb
[12:23:21] [Server thread/WARN]: Keeping entity minecraft:turtle that already exists with UUID 2c4ed69f-a9c2-4da9-a00b-7a622bc8979f
[12:23:21] [Server thread/WARN]: Keeping entity minecraft:turtle that already exists with UUID 8c0c13b5-9f4c-42c0-83e5-c94bd857747d
[12:23:21] [Server thread/WARN]: Keeping entity minecraft:pig that already exists with UUID 2daf01b6-bc2c-478a-8422-e401fb2af330
[12:23:57] [Server thread/WARN]: Can't keep up! Is the server overloaded? Running 4193ms or 83 ticks behind
[12:25:18] [Server thread/INFO]: Saving and pausing game...
[12:25:18] [Server thread/INFO]: Saving chunks for level 'New World'/minecraft:overworld
[12:25:18] [Server thread/INFO]: ThreadedAnvilChunkStorage (New World): All chunks are saved
[12:25:18] [Server thread/INFO]: Saving chunks for level 'New World'/minecraft:the_nether
[12:25:18] [Server thread/INFO]: ThreadedAnvilChunkStorage (DIM-1): All chunks are saved
[12:25:18] [Server thread/INFO]: Saving chunks for level 'New World'/minecraft:the_end
[12:25:18] [Server thread/INFO]: ThreadedAnvilChunkStorage (DIM1): All chunks are saved
[12:34:32] [Server thread/WARN]: Keeping entity minecraft:wolf that already exists with UUID 3bfbceb8-9b41-44f7-9690-d079fe763b0e
[12:35:31] [Server thread/INFO]: Saving and pausing game...
[12:35:31] [Server thread/INFO]: Saving chunks for level 'New World'/minecraft:overworld
[12:35:31] [Server thread/INFO]: ThreadedAnvilChunkStorage (New World): All chunks are saved
[12:35:31] [Server thread/INFO]: Saving chunks for level 'New World'/minecraft:the_nether
[12:35:31] [Server thread/INFO]: ThreadedAnvilChunkStorage (DIM-1): All chunks are saved
[12:35:31] [Server thread/INFO]: Saving chunks for level 'New World'/minecraft:the_end
[12:35:31] [Server thread/INFO]: ThreadedAnvilChunkStorage (DIM1): All chunks are saved
[12:48:22] [Client thread/INFO]: Loaded 479 advancements
[12:58:10] [Client thread/INFO]: Loaded 480 advancements
[12:58:34] [Client thread/INFO]: Loaded 481 advancements
[12:58:50] [Client thread/WARN]: Unable to play empty soundEvent: minecraft:entity.cod.ambient
[13:17:14] [Server thread/INFO]: Saving and pausing game...
[13:17:14] [Server thread/INFO]: Saving chunks for level 'New World'/minecraft:overworld
[13:17:15] [Server thread/INFO]: ThreadedAnvilChunkStorage (New World): All chunks are saved
[13:17:15] [Server thread/INFO]: Saving chunks for level 'New World'/minecraft:the_nether
[13:17:15] [Server thread/INFO]: ThreadedAnvilChunkStorage (DIM-1): All chunks are saved
[13:17:15] [Server thread/INFO]: Saving chunks for level 'New World'/minecraft:the_end
[13:17:15] [Server thread/INFO]: ThreadedAnvilChunkStorage (DIM1): All chunks are saved
[13:20:08] [Server thread/WARN]: Can't keep up! Is the server overloaded? Running 5006ms or 100 ticks behind
[13:20:57] [Server thread/WARN]: Can't keep up! Is the server overloaded? Running 3181ms or 63 ticks behind
[13:27:20] [Server thread/WARN]: Keeping entity minecraft:sheep that already exists with UUID ceb3c359-60fc-42e5-a102-b68eee409b5a
[13:27:21] [Server thread/WARN]: Keeping entity minecraft:villager that already exists with UUID de2059db-940b-4b6d-878d-066eeb2d0e51
[13:27:21] [Server thread/WARN]: Keeping entity minecraft:villager that already exists with UUID 6968209a-8c7b-4762-95e2-93837a350599
[13:27:21] [Server thread/WARN]: Keeping entity minecraft:villager that already exists with UUID 6968209a-8c7b-4762-95e2-93837a350599
[13:27:21] [Server thread/WARN]: Keeping entity minecraft:villager that already exists with UUID de2059db-940b-4b6d-878d-066eeb2d0e51
[13:27:22] [Server thread/WARN]: Can't keep up! Is the server overloaded? Running 5785ms or 115 ticks behind
[13:27:25] [Server thread/WARN]: Keeping entity minecraft:villager that already exists with UUID de2059db-940b-4b6d-878d-066eeb2d0e51
[13:27:25] [Server thread/WARN]: Keeping entity minecraft:villager that already exists with UUID 6968209a-8c7b-4762-95e2-93837a350599
[13:27:26] [Server thread/WARN]: Keeping entity minecraft:sheep that already exists with UUID ceb3c359-60fc-42e5-a102-b68eee409b5a
[13:27:26] [Server thread/WARN]: Keeping entity minecraft:villager that already exists with UUID 6968209a-8c7b-4762-95e2-93837a350599
[13:27:26] [Server thread/WARN]: Keeping entity minecraft:villager that already exists with UUID de2059db-940b-4b6d-878d-066eeb2d0e51
[13:27:27] [Server thread/WARN]: Keeping entity minecraft:rabbit that already exists with UUID 96d6c536-0465-47da-88e8-e1d0562d29d8
[13:27:27] [Server thread/WARN]: Keeping entity minecraft:sheep that already exists with UUID 5786e16a-dde2-46ac-bf30-ff110663b5ce
[13:27:27] [Server thread/WARN]: Keeping entity minecraft:sheep that already exists with UUID 5786e16a-dde2-46ac-bf30-ff110663b5ce
[13:27:27] [Server thread/WARN]: Keeping entity minecraft:sheep that already exists with UUID 61702cdc-7067-469d-be88-6575cd03864d
[13:27:27] [Server thread/WARN]: Keeping entity minecraft:sheep that already exists with UUID 61702cdc-7067-469d-be88-6575cd03864d
[13:27:27] [Server thread/WARN]: Keeping entity minecraft:sheep that already exists with UUID 61702cdc-7067-469d-be88-6575cd03864d
[13:27:28] [Server thread/WARN]: Keeping entity minecraft:chicken that already exists with UUID fba05388-c3c9-481f-9242-f2c81da5f8f4
[13:27:28] [Server thread/WARN]: Keeping entity minecraft:item that already exists with UUID 7fabe7e8-9ddf-4c70-9dba-d57f2724835a
[13:27:28] [Server thread/WARN]: Keeping entity minecraft:chicken that already exists with UUID e81ad0a7-ff45-4a20-a4d0-805e007601c9
[13:27:28] [Server thread/WARN]: Keeping entity minecraft:sheep that already exists with UUID 829c9d9c-0f7d-4c2c-8209-2204b9c5e635
[13:27:28] [Server thread/WARN]: Keeping entity minecraft:item that already exists with UUID 6912f2fb-9adf-42cf-b83e-60dc51582f49
[13:27:31] [Server thread/WARN]: Keeping entity minecraft:turtle that already exists with UUID 2c4ed69f-a9c2-4da9-a00b-7a622bc8979f
[13:27:31] [Server thread/WARN]: Keeping entity minecraft:turtle that already exists with UUID 8c0c13b5-9f4c-42c0-83e5-c94bd857747d
[13:27:32] [Server thread/WARN]: Keeping entity minecraft:chicken that already exists with UUID 1f2e426a-cfad-411d-9b54-a639bad0c1fb
[13:27:34] [Server thread/WARN]: Keeping entity minecraft:chest_minecart that already exists with UUID 6e957748-3cae-4649-813a-f75b1c3aa216
[13:27:37] [Server thread/WARN]: Keeping entity minecraft:chest_minecart that already exists with UUID e01fd08c-4a2f-4294-b9ce-454f8fa0d74a
[13:27:51] [Server thread/WARN]: Can't keep up! Is the server overloaded? Running 2710ms or 54 ticks behind
[13:28:05] [Server thread/INFO]: Saving and pausing game...