When I am loaded into Minecraft and hit "L" to bring up the advancements page, it shows up as the files depict below, not only are most of the advancements gone but I only have three completed whereas I would normally have all of them done.

Launcher Log >> "13:11:26.282
net.minecraft.server.MinecraftServer
Server thread
Vanda42 joined the game
13:11:26.557
eov
Server thread
Saving and pausing game...
13:11:26.579
x
main
Loaded 93 advancements
13:11:26.580
net.minecraft.server.MinecraftServer
Server thread
Saving chunks for level 'ServerLevel[Lasagna]'/minecraft:overworld
13:11:26.886
net.minecraft.server.MinecraftServer
Server thread
Saving chunks for level 'ServerLevel[Lasagna]'/minecraft:the_nether
13:11:26.887
net.minecraft.server.MinecraftServer
Server thread
Saving chunks for level 'ServerLevel[Lasagna]'/minecraft:the_end
13:11:30.267
dyi
main
Received passengers for unknown entity
13:11:31.441
eov
Server thread
Saving and pausing game...
13:11:31.452
net.minecraft.server.MinecraftServer
Server thread
Saving chunks for level 'ServerLevel[Lasagna]'/minecraft:overworld
13:11:31.671
net.minecraft.server.MinecraftServer
Server thread
Saving chunks for level 'ServerLevel[Lasagna]'/minecraft:the_nether
13:11:31.671
net.minecraft.server.MinecraftServer
Server thread
Saving chunks for level 'ServerLevel[Lasagna]'/minecraft:the_end
13:11:35.187
dyi
main
Received passengers for unknown entity
13:11:39.613
eov
Server thread
Saving and pausing game...
13:11:39.625
net.minecraft.server.MinecraftServer
Server thread
Saving chunks for level 'ServerLevel[Lasagna]'/minecraft:overworld
13:11:40.019
net.minecraft.server.MinecraftServer
Server thread
Saving chunks for level 'ServerLevel[Lasagna]'/minecraft:the_nether
13:11:40.020
net.minecraft.server.MinecraftServer
Server thread
Saving chunks for level 'ServerLevel[Lasagna]'/minecraft:the_end
13:11:41.532
zv
Server thread
Vanda42 lost connection: Disconnected
13:11:41.533
net.minecraft.server.MinecraftServer
Server thread
Vanda42 left the game
13:11:41.543
zv
Server thread
Stopping singleplayer server as player logged out
13:11:41.583
net.minecraft.server.MinecraftServer
Server thread
Stopping server
13:11:41.583
net.minecraft.server.MinecraftServer
Server thread
Saving players
13:11:41.583
net.minecraft.server.MinecraftServer
Server thread
Saving worlds
13:11:41.583
net.minecraft.server.MinecraftServer
Server thread
Saving chunks for level 'ServerLevel[Lasagna]'/minecraft:overworld
13:11:46.186
yp
Server thread
ThreadedAnvilChunkStorage (Demo_World): All chunks are saved
13:11:46.186
net.minecraft.server.MinecraftServer
Server thread
Saving chunks for level 'ServerLevel[Lasagna]'/minecraft:the_nether
13:11:46.186
yp
Server thread
ThreadedAnvilChunkStorage (DIM-1): All chunks are saved
13:11:46.186
net.minecraft.server.MinecraftServer
Server thread
Saving chunks for level 'ServerLevel[Lasagna]'/minecraft:the_end
13:11:46.187
yp
Server thread
ThreadedAnvilChunkStorage (DIM1): All chunks are saved
13:11:46.197
yp
Server thread
ThreadedAnvilChunkStorage (Demo_World): All chunks are saved
13:11:46.222
yp
Server thread
ThreadedAnvilChunkStorage (DIM-1): All chunks are saved
13:11:46.222
yp
Server thread
ThreadedAnvilChunkStorage (DIM1): All chunks are saved"