We also see similar problems with generating coverage data (Xcode 13.1):
Failed to merge raw profiles in directory /Users/j<user>/Library/Developer/Xcode/DerivedData/XYZ-aoivlaczsouiakebozusuojanhvg/Build/ProfileData/<UUID> to destination /Users/<user>/Library/Developer/Xcode/DerivedData/XYZ-aoivlaczsouiakebozusuojanhvg/Build/ProfileData/<UUID>/Coverage.profdata: Aggregation tool '/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/llvm-profdata' failed with exit code 1
jdw
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