I also seem to be having this exact issue!
I’ve got a ‘global’ Field Group which outputs a series of general Block config options (width/margin settings) to all Blocks and then Block-specific Field Groups, however when both the ‘global’ Field Group is active and the Block-specific Field Group, only the ‘global’ one appears in the Gutenberg Editor, not the Block-specific content. Disabling the ‘global’ Field Group makes the Block-specific fields appear as usual.
