[Bug]: Some spiders seem to spawn with invisible skeletons

[MagmaMusen]

🐞 Describe the bug?

Players are experiencing invisible skeletons on and off spiders on pyramid raids. Skeletons are not specified in the spawner config for the raid.

Step to reproduce

1. Go on a pyramid raid and play for long enough.

Expected behavior

Just spiders should spawn.

🖼️ Screenshots

No response

Minecraft version

1.16.5

📄Relevant log output

No response

ℹ️ Additional context

No response

✅ Todo

No response