In Scene Builder, we have the following use case :
- in a ComboBox, a user enter a value
- if this value is invalid, the value is set back to the previous value

This validation checking is done in the comboBox setOnAction(), and if invalid, comboBox setValue() method is used to come back to the previous value.

This does not work : the comboBox still display the invalid value.
Now, if we use the comboBox getEditor().setText() method, this is working fine !

I was not (yet) able to reproduce in a separate test case. This can be reproduced using SB, from any inspector ComboBox.