The script was checking if a bone was selected via Bone.select. As of 5.0, this is not available. Instead, PoseBone.select should be used. Pull Request: https://projects.blender.org/blender/blender/pulls/147743
The script was checking if a bone was selected via Bone.select. As of 5.0, this is not available. Instead, PoseBone.select should be used. Pull Request: https://projects.blender.org/blender/blender/pulls/147743