The issue seems to arise when you add arm64 as an excluded architecture, which affects some sort of sha-1 hash output. This hash seems to be used as the filename for the file used to transfer contents from your developer machine to the simulator, but because there's now a mismatch, that transfer fails and pasting fails to work. At least, that's my theory. I've filed a bug under ticket FB9964084, which includes a demo project.
Eriq
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