In my own experiences with two projects, either building from Xcode 11.6 or Xcode 12 beta 3, the issue of Realm lock file in shared group did exist on real devices. If you use the simulator, everything is fine.
Realm 5.3.2.
There is an issue on realm too. But it seams people believe it is Apple who to blame.
https://github.com/realm/realm-cocoa/issues/6671
Topic:
App & System Services
SubTopic:
General
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