SF Symbols missing in iOS 13 version of app

I'm using Xcode 12.2 and have an app that support iOS 14 and iOS 13. I just release a new version of the app and iOS 13 users are seeing missing SF Symbols. For example, x.mark.circle does not appear in the iOS 13 version of the app.

Does anyone have any ideas? I have some very unhappy users. Rebooting, reinstalling does not fix the issue.
Answering my one question in case it helps someone. All the SF Symbols were referenced in Storyboards and were using a rendering mode as Automatic. Changing to Template seems to fix the issue. I'm not sure why this broke in iOS 13 when I moved to Xcode 12. BTW, the original message had a type x.mark.circle -> xmark.circle.
SF Symbols missing in iOS 13 version of app
 
 
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