Its really annoying
nargarus
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What now always works for me now is (after weeks of real pain with SPM behind a corporate proxy):
On the terminal
xcodebuild -scmProvider system -resolvePackageDependencies -disablePackageRepositoryCache -workspace MyProject.xcworkspace -scheme MyScheme
On XCode after the xcodebuild finishes
XCode - File - Packages - Resolve Package Versions.
I hope this is of any help.