The bug

When an area effect cloud is teleported, it looks to the client as if the cloud wasn't teleported, while it actually changed its position.

How to reproduce

1. Enable F3+B
2. Run

   /summon minecraft:area_effect_cloud ~ ~ ~ {Duration:1000s}

3. Go some blocks away
4. Notice that there now is a white line where you stood (that's the area effect cloud)
5. Run

   /teleport @e[type=minecraft:area_effect_cloud] ~ ~ ~

6. Notice that the white line did not move
7. Close the world and re-enter it
8. Notice that the white line now changed its position

Original description

I can't teleport an area_effect_cloud

Summon area_effect_cloud:

/summon minecraft:area_effect_cloud ~ ~ ~ {Duration:100s}

Try to teleport:

/tp @e[type=area_effect_cloud] ~ ~1 ~
/tp @e[type=area_effect_cloud] ^ ^ ^1
/tp @e[type=area_effect_cloud] @s