Is better to comment these red screens on the English/gameDev/Extensions channels at discord before doing the bug report, this way you can discard your method being the problem. Also, have you tried asking the AI at the Discord server about it, sometimes it helps me understand what’s going on, or even fix the problems.
I remember that custom / pre-made objects are still experimental, which is explained in the release note.
This means it’s not yet stable and there may be changes.
But if you think it’s a bug, it’s fine to report it, but we might break something on an experimental feature still under development.