Moh and sound_leave precedence

Hi all,
i’m new in this forum and I’m an asterisk newbie.

I’m using Confbridge, i would like to have moh when the conference start and there is only one person (who stop immediately when someone else join) and one when the person leave play a specific file.
If i enable moh when two people remains an one leave moh has the precedence on the sound_leave playing, even if asterisk console says Playing ‘confbridge-join.slin’ .
If i remove moh i can hear that file.

Is possible to play sound_leave before starting moh file when just one person remains in the conference?
I’v tried also with sound_only_person, same behaviour.

I’m running asterisk 16.6.2
Thank in advance