QTabBar tabs above current index not visible if current index is set before the tabbar is drawn

There is one more regression after recent changes to QTabBar, previously reported issue here: https://bugreports.qt.io/browse/QTBUG-113345

Using a vertical tabbar with icons and text, the items above the current index is not shown if the current index is set to other than 0 before the window is drawn.

The issue first occur in Qt 6.5.1, same issue with the latest code from the dev branch.

I'm using a custom tabbar similar to the one in Qt Creator: https://github.com/strawberrymusicplayer/strawberry/blob/master/src/widgets/fancytabwidget.cpp

If I move setCurrentIndex() to the showEvent() the issue does not occur.

I'll attach a video showing the problem.

vhilshei