[Bug] Flag groups are not properly handled in selections and exports

[MrClock8163]

Blender version

v3.6.1

Add-on version

Release

Description

The flag groups are not properly handled for vertices that have invalid group indices for some reason. The selection and export processes did not properly fall back to the 1st group or the default value in such cases.

Steps to reproduce

1. Add cube
2. Set cube as LOD object
3. Add a vertex flag group
4. Add a second vertex flag group and assign a few vertices to it
5. Export P3D
6. Inspect vertex flags

Stack trace

No response

Contact details

No response