Poly groups are not being imported into Blender - version 4.1.9

[PiotrPisiakBCS]

It was working but it stopped for some reason. I tried Blender 4.3, 4.4, 4.5 - the same effect - not importing polygroups, polypaint works.

[PiotrPisiakBCS]

It was working after restart of PC for a while, now it has stopped again. I've noticed that cloning subtool in zbrush creates problem for importer - it imports without polygoups. Third/second reimport into Blender is also problematic.

[Boozebeard]

Also having problems with keeping poly groups. Part of the problem seems to be if the subtool is made of multiple unconnected meshes. If I pass sphere with polygroups through gob it keeps them, if I merge another subtool into it, or duplicate the sphere geo within the same subtool it stops working.