I also have the same problem.
In my case, what differs from randexdev is that the minimum iOS version is 11.0 and there was no ITMS-90473 warning.
shoji_bf
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I found the same crash in Xcode organizer.
In reference to the tweet below, I set the "Dead Code Stripping" setting in both Widget.appex and Intents.appex to "No" and the widget is now available.
ttps://twitter.com/smartvipere75/status/1289523900754272264
But I hope to get this setting back before the official iOS 14 release.