save_project Throws Plugin not load error

[Trevirirus]

Hey,

i want to save a mesh set to u3d file with the save_project function.

Unfortunstely this returns the Error:

Some\file\path\named_file.u3d cannot be loaded. Your MeshLab Version has not Plugin to load u3d file Format.

Im on Python 3.12.8 and reading some PLY files to a meshset for then saving Thema to u3d for PDF creation.

When printing the active Plugins the iou3d is listed.

[Trevirirus]

Saving the current mesh works fine