This issue came out as a part of recently added Stage Attributes test (see related issues).

When setting a Stage to be Maximized or FullScreen before calling show(), Stage shows up maximized/fullscreened, however it immediately animates to non-maximized/non-fullscreen state. Run attached test program to see more.

I had one situation where the stage actually started windowed and animated to be maximized, it happened randomly when running the attached app multiple times, but I couldn't reproduce it again.

Issue happened on Fedora 38 (Linux 6.4) VM with X11 window system. Attached program works properly on Windows.