How do I diagnose and fix breakpoints that Xcode cannot resolve?

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Every now and then Xcode 13.3.1 (and 13.3) will fail to resolve breakpoints. It seems limited to the project but won't work until I have fully cloned the project.

Other projects - same machine, same time - will work as expected. No changes appear within Git.

It looks like this in Xcode

Issue

All the usual tricks have been applied:

  • restart Xcode
  • restart simulator/device
  • clean
  • delete Derived Data
  • deleted breakpoints, and re-added
  • run breakpoint list while paused

I'm keen to know how to diagnose, fix, and ideally prevent this occurring.

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