This does appear to be a b3-unique thing, and judging by the crash logs I'm seeing on-device, it's affecting system apps like Spotlight and Safari as well. I also am unable to reproduce it at all when building using Xcode 12 to device (only Xcode 11-built binaries seem to reproduce it), but that may be a coincidence.
I have also filed FB8116961 for this one.
zacwest
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