CEC: EXIT key stopped working after upgrade to LE12.2.1

  • I own a Toshiba TV 48L344*DG connected to a Raspberry Pi 3B+ via HDMI.
    The Pi ran LibreElec 11.6 for quite some time. Very recently I upgraded to LE12.2.1 using LibreELEC-RPi2.arm-12.2.1.img.gz. The upgrade went flawlessly and I'm very satisfied with the result because there are a couple of improvements:

    • Startup seems to be faster,
    • The overall responsiveness and stability has improved a lot,
    • Also, upgrading of plugins incompatible with the new version was possible and a piece of cake.
    • CEC is now stable and does not stop working after some days of inactivity -as far as I can say up to now.

      The only regression which is bugging me: the EXIT key - which has always brought me back to the Kodi Homepage - has stopped working.
      I started Debug-Logging, observed the Log using tail -f /storage/.kodi/temp/kodi.log and there is absolutely no output when I press EXIT.
      The cec_CEC_Adapter.xml is:


      There is no difference if I set the device_type to Recording or Playback.
      I read there have been a lot of changes in the CEC stack (making it obviously more stable).

      What could be the reason for the EXIT key not working anymore and is there a solution to this problem?