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I'm experiencing the same issue with Xcode 12.1 and all newer versions. It happens ONLY on my second monitor (configured as my main monitor). It does NOT occur when I open Xcode on the integrated monitor of my MacBook Pro.
The crash occurs in the "Behaviors" menu and when trying to "Manage Schemes".
I attached a crash log for one of the cases.
My fix for now is to move Xcode over to the integrated monitor before opening one of the menus.
Facing exactly the same problem: XCode crashes on some actions only when I use an extra monitor. The same things are working ok if I use laptop only. 🤬🤬🤬