To handle this issue, I had to install Sonoma with Xcode 15.4 on another volume. So now I'm developing in Sequoia/Xcode 16 but need to reboot to Sonoma/Xcode 15.4 in order to build and distribute (as I want to support 10.15+). Not perfect solution at all, but it may allow me to survive until this issue is fixed, as I release every 2-3 months.