"Run Script" task is being duplicated when doing an "Append" build on top of a previous build

How to reproduce:
1. Build the attached “BugReport.zip” project for iOS platform
2. Build the project for the iOS platform again and select “Append” when building
3. Open Xcode project
4. Open Unity-iPhone > Build Phases and select “GameAssembly” in the Targets
5. Observe the result

Expected result: one “Run Script” task
Actual result: two “Run Script” tasks

Reproducible with: 2022.3.16f1, 2023.2.4f1, 2023.3.0b1
Could not test with: 2021.3.33f1 (No “GameAssembly” in the Targets)

Reproduced on: macOS 13.6.3 (Intel)
Not reproducible on: No other environment tested

Note: not reproducible if pressing “Replace” when building the second time