Crash when creating cyclic host nesting between elements #7248
Description
Bug Description
When creating two wall elements (e.g., Wall A and Wall B) and assigning Wall B as the host of Wall A, and then Wall A as the host of Wall B — thus creating a cyclic reference — Blender crashes as soon as either wall is moved or interacted with.
Steps to reproduce:
1 - Create Wall A.
2 - Create Wall B.
3 - Set Wall B as the host of Wall A.
4 - Set Wall A as the host of Wall B.
5 - Attempt to move either wall in the viewport.
6 - Blender crashes.
Expected behavior:
Blender should detect and prevent cyclic nesting or handle it gracefully without crashing.
Additional Notes
If the file is saved with cyclic host nesting, opening it again will cause Blender to crash immediately — no user interaction required. This suggests that neither Bonsai nor IfcOpenShell is validating or guarding against cyclic references.
Attachments
IFC File -> sample.txt
Debug and Error Output
Blender 4.5.3 LTS
Bonsai 0.8.3-post1
Python 3.13.7
Windows 11
I honestly don't know if Bonsai generates logs for this, for it seems like an infinite loop...