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I’m in the process of trying to fully convert my project to androidx. Having a weird crash before my Activity even gets started: Caused by: java.lang.ClassNotFoundException: Didn’t find class “androidx.appcompat.R$drawable”

I don't think that's related to upgrading the support library. have you tried cleaning and rebuilding the project ?

Small commit, clear build cache, clean, run, repeat. agreed.

It was a problem with the ObjectBox library