[Bug]: Vanilla entities on a dedicated server behave as though they aren't present clientside

[Not-February]

Modpack (Optional)

No response

Game log

fml-client-latest.log

Description

Seems to be exactly what #163 is referencing: vanilla entities of seemingly any kind(animals or monsters at the very least) act as though they don't exist clientside when connected to a dedicated server.

You can still hear them and if they interact with the world(or you), like attacking you or opening doors, you are still affected - but it is impossible to actually interact with or even see that these entities exist at all on the client.

This issue does not occur in single player.

This is easily reproducible with nothing but Endless IDs and its dependencies installed on a Forge dedicated server.

When other mods are present, their entities will work as expected - this problem only affects vanilla Minecraft mobs.

I'm noticing a lot of "Skipping Entity with id 0" spam in the client log whenever I'm near entities, even though I can't see or interact with them at all.

Setting Endless ID's extendEntity config option to false makes the problem go away in its entirety.

Versions used to test:

Forge 10.13.4.1614
ChunkAPI 0.5.1
EndlessIDs 1.5.3
FalsePatternLib 1.4.1
UniMixins 0.1.17