[REG 5.15.7->5.15.8] Qt Quick 3D window blank on startup

The main window of applications using Qt Quick 3D are blank on startup with the Qt versions given above. Versions 5.15.7 and older are unaffected. Moving the window outside the monitor causes the window content to appear.

Build tools used - MSVC2019 64bit, Microsoft Visual C++ compiler 17.0.32428.209 (amd64), mingw81_64

This can be reproduced using the antialiasing sample (attached)