I have had a weird problem with goz lately, particularly with GOB, the plugin for blender that allows the goz link with blender.
The issue is duplication of meshes when exporting from blender to zbrush, rather then a re-projection of details. This happens even if I do absolutely nothing to the model in blender.
People on the zbrush discord have said that it might be caused by zbrushs internal naming system and is supported by the fact that objects from blender remain linked as you would expect. But manually re-naming the subtool (the supposed way to fix sync the name to the internal name) did not work. But this might also be supporting where a duplicated object (where the name was changed) was deleted when data was sent from the two meshes in blender.
Thanks for reading through and any help, I will be glad to answer any questions and clarify the post.