How to reproduce:
1. Open the attached 'MacXcode.zip' project
2. Switch to IL2CPP Scripting Backend in Player Settings
3. Go to Build Settings and check Create Xcode Project flag
4. Select Intel 64 - bit architecture
5. Build the project
6. Run the Xcode project

Expected result: .bundle plugins are signed in Xcode project(2019.4.11f1, 2020.1.7f1, 2020.2.0b4) and build succeeds (2019.4.11f1,2020.1.7f1)
Actual result: .bundle plugins are not signed in Xcode project(2019.4.11f1, 2020.1.7f1, 2020.2.0b4),errors are thrown to the console and build fails(2019.4.11f1, 2020.1.7f1)

Reproducible with: 2019.4.11f1, 2020.1.7f1, 2020.2.0b4
Could not test with 2018.4 because Xcode builds for Mac are not supported

Notes:
- Detailed note from the customer is left in the Edit
- Not a duplicate of 1237217
- Reproducible on macOS 10.15.3 Catalina, macOS 10.15.6 Catalina, macOS 11.0 Beta Big Sur
- Screenshots of the issue are attached in Edit
- Error thrown to the Console:
CodeSign /Users/customer/Library/Developer/Xcode/DerivedData/MacXcode-ddporllwmsqitcfnqhidpczffuop/Build/Intermediates.noindex/ArchiveIntermediates/MacXcode/InstallationBuildProductsLocation/Applications/MacXcode.app/Contents/PlugIns
cd /Users/customer/Desktop/bbb/MacXcode/Build
export CODESIGN_ALLOCATE=/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/codesign_allocate

Signing Identity: "-"

/usr/bin/codesign --force --sign - --preserve-metadata=identifier,entitlements,flags --timestamp=none /Users/jason/Library/Developer/Xcode/DerivedData/MacXcode-ddporllwmsqitcfnqhidpczffuop/Build/Intermediates.noindex/ArchiveIntermediates/MacXcode/InstallationBuildProductsLocation/Applications/MacXcode.app/Contents/PlugIns