I have the exact same issue, damn :D
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Same in Hungary, Transporter app worked just fine
We do not use any obj-c code in our project, so our solution was to set the SWIFT_INSTALL_OBJC_HEADER
build setting to 'NO' for all the pods in the post_install hook of cocoapods.
Still having this issue with XCode12 GM
Following this, this bugs me since the first xcode12 beta, it was working fine in xcode11.