ADDITIONAL SYSTEM INFORMATION :
OpenJDK 21 + JavaFX 21

A DESCRIPTION OF THE PROBLEM :
When a TableView's selection is non-empty, its focus-within will remain true even after an unrelated Node in the same Scene has been focused. When a TableView's selection is empty, focus-within will become false when another Node is focused. It is not expected/intuitive for a TableView's focus-within behavior to depend on whether its selection is empty or not. I would expect the TableView's focus-within to behave consistently with any other type of Node: focus-within should always immediately become false whenever the Scene's focus moves elsewhere.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Clear instructions are provided in the README.md of the given github repo.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
The TableView's focus-within should behave the same as if this were any other type of Node. More specifically: redirecting focus to the TextField should remove focus-within from the TableView regardless of whether the TableView's selection is empty.
ACTUAL -
Only when the TableView's selection is non-empty, its focus-within remains true even after an unrelated Node within the Scene has been focused. This results in unexpected/unintuitive behavior for usages of focus-within on the TableView. For example, in a different app I have a Pane containing a TableView in addition to other types of Nodes. I wanted to style that Pane differently to make it visually obvious whether anything inside it contains focus. Because of this bug I was not able to do that.

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https://github.com/tcfurrer/javafx21-tables-focus-within-bug
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CUSTOMER SUBMITTED WORKAROUND :
The only known workaround is: instead of using JavaFX's built-in focus-within property, implement an entirely independent custom alternative (as was done prior to the introduction of focus-within).

FREQUENCY : always