I'm trying to do a fabric server on 1.16.5 and it kicks me when I morph.

Here is the console log when I try to reconnect.
https://pastebin.com/j2PzLMRJ

And those are the mods I'm using

Same as #299, but I don't have time to fix the 1.16.5 branch right now. If I forget to fix this tomorrow, feel free to give the issue a bump. Thanks for the detailed report.

I just tested and it doesn't happen only with the shulker :/

This happens on survival and creative mode.