I've updated Studio 2021 to the last version available (SR2 - 126.96.36.19905).
According to the changelog posted by Paul, the SR 2 CU10 update for the WorldServer Compatibility Pack was to be released on May 4th.
But, it doesn't seem to be available in the AppStore. Nor is it in this list: gateway.sdl.com/CommunityKnowledge
Any info? Thanks.