This issue appears to be fixed for me in 13.2 beta 2 (13C5066c). I did a full clean build (and nuked derived data) and the issue is gone!
TheWatcher37
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Xcode 13.2 beta (13C5066c) still has this issue!
Clearly Xcode devs missed this, since they were working on their pre-release 64GB M1 max machines...
This bug also makes the entire system unresponsive, as it thrashes to disk/swap. My SSD will read/write at 900+ MB/s.
This bug will put a ton of wear and tear on our SSDs...