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Xcode and Swift Package Manager fails to resolve locked Package.resolved modules when switching between git branches while Xcode app is open.

Tested on Xcode 12.0.1 and 12.2 beta 2 (12B5025f)
Occurs about 75% of the time.

Sample app can be found here: GitHub - raymondk-nf/LocalSwiftPackageTest
Follow Swift forum thread here: "Missing package product" error for all local Swift Packages when switching git branches - #3 by ray

Repro steps:

  1. Open Test projected in either Xcode 12.0.1 and 12.2 beta 2 or higher
  2. Wait for Xcode to download and resolved all SPM packages.
  3. Then switch to another branch with “git checkout Test --“ while leaving Xcode app open.
  4. Observe more often than not, Xcode has altered the “Package.resolved” file unexpectedly.
  5. If not, go back to master branch and repeat steps 2-4

On master branch, SPM Apollo module is set to version "0.34.1” in Package.resolved. On Test branch, SPM Apollo module is set to version "0.28.0" in Package.resolved. After switching to Test branch, I expect Xcode to resolve Apollo module version to “0.28.0” but instead it seems as if Xcode did not recognize that Package.resolved file changed during branch switching.

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@NeoNacho Filed a Radar FB8783743

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Hello,
I'm experience the same problem with Xcode 12.4. When I do git checkout on different branches, then I receive the errors as decribed above. Via "Resolve package versions" I can fix this error but I have to do it every time I switch branches and/or I do git stash pop.

Is there any progress on this issue?

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This other thread has more detailed information (but still no solution):

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