After the release of Betaflight 3.4 some people started noticing that their push-button on their vTX didn't work anymore. Or their Tramp Wand didn't work.
The reason for this is that Betaflight 3.4 changed the way SmartAudio (vTX Remote Control) worked. So what's the fix? Ummm... there actually isn't a great answer to that. At least not yet.