ADDITIONAL SYSTEM INFORMATION :
Ubuntu 22.04.3 x64
Gnome 42.9 Wayland
JDK 21.0.1

A DESCRIPTION OF THE PROBLEM :
See the reproducer example. When clicking on the other titled pane, the pane expands and the dialog buttons are no longer visible. The height does get calculated correctly.
Terminal prints
(java:28148): Gtk-CRITICAL **: 16:52:40.137: gtk_window_resize: assertion 'width > 0' failed

See screenshots for javafx 21 and javafx 20
https://github.com/Siedlerchr/javafxreproducer/issues/2

REGRESSION : Last worked in version 20

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Execute the reproducer example with ./gradlew run or use the precompiled jlnk binary from the
To compare with javafx 20 simply replace the javafx version in the build.gradle

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
The dialog buttons should be still visible after expanding
ACTUAL -
The dialog buttons are no longer visible

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https://github.com/Siedlerchr/javafxreproducer/tree/main
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CUSTOMER SUBMITTED WORKAROUND :
Downgrade to javafx20

FREQUENCY : always