ADDITIONAL SYSTEM INFORMATION :
KDE Plasma / X11 javac 17

A DESCRIPTION OF THE PROBLEM :
Stage.setAlwaysOnTop(true) acts like success, Stage.isAlwaysOnTop() reports true, but checking the OS Window and actual behavior show failure.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Build this small app.

https://github.com/markcapella/fxClock

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
App should remember it's "always-on-top" setting after every close and restart.
ACTUAL -
App sometimes silently fails to remember to be always-on-top.

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https://github.com/markcapella/fxClock
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FREQUENCY : often