To reproduce:
1. Download attached project "TestMacOSNotarization 2.zip"
2. Setup MacOS distribution certificate from the apple developer site
3. Open the terminal and navigate to project folder
4. Type this command in the terminal:
chmod -R a+xr /Users/username/Downloads/TestMacOSNotarization/TestBuild.app

5. Then type this command
codesign -f --deep -s '3rd Party Mac Developer Application:developer ID' --entitlements "/Users/username/Downloads/TestMacOSNotarization/FFF.entitlements" "/Users/username/Downloads/TestMacOSNotarization/TestBuild.app"

Expected: the app is cosigned successfully, no errors are thrown into the terminal

Actual: getting this error in the terminal:
"/Users/username/Downloads/TestMacOSNotarization/TestBuild.app: bundle format unrecognized, invalid, or unsuitable
In subcomponent: /Users/username/Downloads/TestMacOSNotarization/TestBuild.app/Contents/Frameworks/MonoBleedingEdge/etc/mono/2.0"

Reproduced on:
2019.2.0b1 2019.2.0f1 2019.3.0a1 2019.3.0a11

Not reproduced on:
2018.4.6f1 2019.1.0f1 2019.1.14f1 2019.2.0a14

Notes:
- When building on a different version with different app name, in given terminal commands change "TestBuild" to your selected name or save the new app using "TestBuild" name
- Reproduced on Mono
- Doesn't reproduce with IL2CPP