The root issue is that Z-Wave action buttons are implemented through a very ugly „hack“, which wasn’t working back then in the UI and it can absolutely be that it broke again. I’ve created an issue and pinged the binding maintainers over a year ago asking them to migrate to Thing actions so we can get rid of that hack, see Replace config actions with Thing actions · Issue #17992 · openhab/openhab-addons · GitHub .
Anyway, seems we have to look at the Main UI code and fix it, the regression might not only affect the Z-Wave actions …