I recently update my asterisk to the version 16.2.1 and I realized that the MWI is not working, I left voicemail on any device and the light is not turned on until I made a core reload, and if I listen the voicemail the light stay on.
I suppose that patch was already merged in the latest versions of Asterisk. However the MWI still not working, and I have the latest version of Asterisk.