I just switched a macOS project to Xcode 9 and have trouble getting the produced app to work on older systems. I'm able to use the app on 10.13 and 10.12, but on 10.11 and 10.10 it crashes on launch with EXC_CRASH (Code Signature Invalid). I tried both Development Signature and Developer ID Signature, neither works. Even App Review rejected the app because of that (so App Store Signature is broken too).
I regenerated all provisioning profiles and even created a new Developer ID Certificate, nothing helped. Xcode doesn't complain either about missing Entitlements or incompatible profiles.
Any help is appreciated, I'm clueless right now.