Unable to read MobEffects with Build #599

[ventolotl]

• [x] This issue is not solved in a development build

Describe the bug

When you listen to the RemoveEntityEffect packet and try to read it by packet.getEffectTypes().read(0), ProtocolLib fails and produces an error. I tested it on a 1.16.5 server.

This issue first appeared in Build #599 (https://ci.dmulloy2.net/job/ProtocolLib/599/) and did thus not appear in Build #598. Therefore, the error is somewhere in commit #1869.

To Reproduce Steps to reproduce the behavior:

1. Listen to RemoveEntityEffect
2. Write packet.getEffectTypes().read(0)

Expected behavior You will get the error:

FieldAccessException: Field index 0 is out of bounds for length 0
    at com.comphenix.protocol.reflect.FieldAccessException.fromFormat(FieldAccessException.java:49)
    at com.comphenix.protocol.reflect.StructureModifier.read(StructureModifier.java:218)
    ...

[dmulloy2]

What server software are you using?

[jpenilla]

What server software are you using?

I would expect this to happen on Paper and Spigot, see my comment on the linked PR