Issue was caused by do_versions being used pdata as reference for active/render/ stencil/clone layer indices instead of fdata. Added some utility functions used only by do_versions to be sure this indices are set from fdata for pre-bmesh files.
Issue was caused by do_versions being used pdata as reference for active/render/ stencil/clone layer indices instead of fdata. Added some utility functions used only by do_versions to be sure this indices are set from fdata for pre-bmesh files.