[API] Selection no longer working

Issue type

Other type of issue

Description with steps to reproduce

1. Open MuseScore.
2. Create a blank, one-staff score with 32 measures.
3. Run this simple plugin:

import QtQuick 2.0
import MuseScore 3.0

MuseScore {
    onRun: {
        if (true) {
            cmd("select-all")
        } else {
            curScore.selection.selectRange(0, 1920, 0, 1)
        }
        curScore.startCmd()
        var text = newElement(Element.STAFF_TEXT)
        text.text = curScore.selection.elements.length.toString()
        var c = curScore.newCursor()
        c.rewind(Cursor.SCORE_START)
        c.track = 0
        c.add(text)
        curScore.endCmd()
    }
}

Expected result: A new staff text element with the text '32' is added to the score.
Actual result: Nothing happens.

Supporting files, videos and screenshots

What is the latest version of MuseScore Studio where this issue is present?

4.5.2 and master

Regression

Yes, this used to work in a previous version of MuseScore 4.x

Operating system

Windows 10

Additional context

Select-All:

• This works as intended in MuseScore 4.2.0, but not 4.3.2.

Select range:

• MuseScore 4.2.0 selects the range, but adds a text saying '0'. Presumably the selection state is not updated until endCmd() is called. Has no effect in 4.3.2+

Checklist

• This report follows the guidelines for reporting bugs and issues
• I have verified that this issue has not been logged before, by searching the issue tracker for similar issues
• I have attached all requested files and information to this report
• I have attempted to identify the root problem as concisely as possible, and have used minimal reproducible examples where possible