Tested in Ableton and Reaper, but I guess it's most likely happening in other DAWs, too. This is with an FX plugin, I haven't tested with instruments.
When clicking on a UI button that's enabled as a plugin parameter, the button callback is executed properly, but the plugin parameter's value is not updated. This is regardless of meta parameters and radio groups, I tested it with these on and off.
The buttons also don’t respond to being changed from the DAWs plugin parameters.
Sliders work fine.
@Christoph-Hart I'm sure you can solve this!
Here's a minimal snippet - it needs to be built first, of course - but it's not anything ultra clever, just a slider and button set as plugin parameters...
HiseSnippet 791.3ocsU0saSCCE1tqYZs.iMId.xkanIT+acqhKnz+fJnaQjwD2M7bbZrZhcThyFUHd21iDuAfcRZSKKqqqRjKp54+Oe746Xi.NlDFxC.vxWL0m.fOWybJS3z0AQYfg8.vc0FgBEj.8DUcl5iBCIV.HbqOnT.KUDD+8620A4hXXRlJ.3RNES9L0iJxzZz9STW2AHKxETuE7tQ6gXNqK2kGIwyVZU.9H7DzXxYHkaEz.eDE5.fuV63Z0wMrNwpVsia0DiZRZYirsqV2pQilm1pZ8VnFm1jT4X.b69VTAOvTfDjPYR6vslZ5vukkTfKogzqcIJgp.SYkSTC55PcsLl0bBA.XQirV0VIspWoMhZQmqOqksWrA8rHVroAKrJHU8I.I3BPpXBj1WyDGP8EYVT34YZCYxaPaj7tYQnj3K.dmVWtzAl3MdnIjAARg4AbPyJUNRW9ygu0NhgETNSmyNiKHmyN3vx+rbox+pr9+Zx1NWapxDvccIA4ZVMNDrp.OfE4cMI3H8aPtQj4NJO9K2S2d85o3jS8BNxYCYTw49jT4AbWKUuR8+6eC.Raax6hBoHT5pH9lX2zahNQBAmAnxj7xkTUEDeHVjr.dnjX5RsHAKkjDU4kjuNrGRfTyGovSBYeRffp5LvdjajLxjokRZ8HgSDb+X764yYpCCbm09D7i4E9twsmlgBZ6aoVBIUUCZIEcHzwNhYR9tQioLCTfjUKGxRH26IGA4t59yzBngFK6mD6E.OLJWQKJCkeObsQYt0OWnKQfKEOQOLAAf6yJk6C3VQtHwxKITqOSMHmxWhYpnerPpX5hqWeBaNprxMGqKD2WyfJvN4iwB4fQEQ3+.FS229Bs911DrHCfE0F7sMc45iT9uviDT13QHQ.UN.ocVjmo7cILQVcFi3FpFTJn3rIxUTxpNfIgYEK7G4WpwpJYXpwpyLB7P3.9U3DRuZi9NwZjXhEOYUR9zqTVOGVtm7Alqv3kS08Br1lFX8MMvFaZfGuoA1bSC7jMMvSe7.Uu++9HA2Kg1..iL5GuUFB6yPxIv3oUveEHoWlM