Describe the solution you'd like

Placeholder is removed.

Describe alternatives you've considered

Dissallow ability to have insertionIndex in BetweenBaseAndScripts position if there is a placeholder.

Difficulty: How difficult would it be? (Trivial, Very Easy, Easy, Moderate, Hard, Very Hard, Tedious, Backbreaking)

Easy, I suppose

Additional context

Currently there are already 2 test-cases that failed because of that.