This was tested in the Modpack BMC4 v 23HF -
Said modpack allows picking up smaller entities with shift+rightclick.
This can be used to mount smaller mobs on deep_aether:quail, which then causes the quail to tick, potentially even causing a server crash. (Due to making the server run too far behind)

This was tested with twilightforest:squirrel, twilightforest:dwarf_rabbit, but more importantly also minecraft:rabbit. (In a singleplayer world)
After this caused a server crash, the stacktrace repeatedly ran through line 249 in quail.java.
Attached image occured after placing a minecraft:rabbit on the quail.

This was tested in the Modpack BMC4 v 23HF - Said modpack allows picking up smaller entities with shift+rightclick. This can be used to mount smaller mobs on deep_aether:quail, which then causes the quail to tick, potentially even causing a server crash. (Due to making the server run too far behind)

This was tested with twilightforest:squirrel, twilightforest:dwarf_rabbit, but more importantly also minecraft:rabbit. (In a singleplayer world) After this caused a server crash, the stacktrace repeatedly ran through line 249 in quail.java. Attached image occured after placing a minecraft:rabbit on the quail.

This has "deep_aether-1.20.1-1.0.12.jar" for the mod, also. Forgot to include that :,) sorry