This appears to have been an Xcode bug that has now been fixed as of Xcode 12 beta 6.
Bill Hollings
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This is still happening in Xcode 12.0 beta 6 (12A8189n).
I have filed a report on Feedback Assistant.
This is still happening in Xcode Version 12.0 beta 4 (12A8179i).
The ProcessXCFramework step seems to copy the Header directory from each of our XCFrameworks into the same Build/Products/Release/include directory, apparently overwriting the headers from one XCFramework with those of the next.
I'm not sure why Xcode would even need to create a temporary build copy of the contents of the XCFramework Header directory at all. That seems odd.
Feeback Assistant in both App and Web forms does not allow me to create feedback.In the App, the New Feedback button and menu items are disabled. The website just displays a static Where would you like to start your feedback page with absolutely no links, buttons, or options to do anything.