MacOS 10.9.5 - "Symbol not found: _OBJC_CLASS_$_NSMutableURLRequest”

This is interesting. Can you run otool -L on both the binaries (the broken one built with Xcode 12.2 and the one built with an older Xcode) and post the output? It’d be useful to see if perhaps the include order of the frameworks has changed. It might be similar to this AudioUnit issue:

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