I use MSFS 2020 + FSUIPC 7.4.17 + Project Magenta 737 + cpflight hardware/transponder. All has been stable as a rock since 2010(!) but since the stable update to vpilot 3.11.2 yesterday (from the previous stable version), moving my cpflight hardware transponder from Standby to Mode C (or vice-versa) does not register anymore in vpilot, nor does pressing the Ident button
EDIT 1 - Just restarted everything and tested again, moving from Standby to Mode C now works. But I note pressing the hardware Ident does not register anything in vpilot, although it has been such a long time since a controller requested this that I cannot say if this is a recent problem or not