Itried to copy and paste contraption with cannons and this happened

left is original cannon, right is "ghost" with collision, but i can't break it
i dk how to reproduse it, but i can give you schematics with this bug

Try /flywheel backend and switch the setting back and forth to "refresh" the rendering engine. If it isn't graphical (which you seem to suggest that it isn't), I'll take a look at it

https://drive.google.com/file/d/1W93zdXxSAoLJk8i7xP3W5M0suAzHMmgs/view?usp=sharing
it works in different worlds though, maybe problem in this schematics?
Edited: Those "cannon entities" still in schematics, even if i deleted cannon mountings and cannons.