I too am having this issue.
Looking in Console shows several other processes crashing at the same time (assistantd and Budd and sometimes parsec-fbd)
bilm
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I too have this problem: app uploaded (duplicates rejected) but not showing in TestFlight.
I can also verify that unchecking both "bitcode" and "upload symbols" works, in that it took less than 30 secs for the version to upload and appear in TestFlight.
Wow. yeah I am in agreement with jh_tds, this has reappeared in XC 12 beta6.
An update: When I found the Control Center section in Settings, and started turning off what was displayed in the menu bar, and switched off the Battery entry, everything quieted down, and Crash Report stopped running.
Just so you know.