Custom button highlight is incorrect with PySide6

Highlight behavior for a custom QML button differs from QDS and CMake when run using PySide6

Steps to reproduce

• Open the attached Python project Project.zipin Qt Creator 15
• Install pyside6 and pyside6_ds (Do the latter manually. See PYSIDE-2980)
• Run the program and hover the mouse over the button
• Repeat using the CMake project (in Qt Creator) and the qmlproject (in QDS 4.6)

Button appearance without mouse hover (correct)

Expected highlight appearance (Run from QDS or with CMake)

Incorrect highlight when running the Python project