Because you said “proxy” I’m going to assume you meant you are linking and not appending.
There has been some improvements to the linking for both proxies and library overrides since 2.80 was released but it is by no means stable. The last time I checked, you still couldn’t link in multiple proxied versions of the same rig but you can when you use library overrides. (You can just duplicated the entire collection).
Library overrides is going to be the new way Blender will work (Proxies will be retired), but overrides still have A LOT of issues at the moment. I’m sure it will improve though.
So if you’ve got it working for what you need, cool. It works!
