Should be fixed with release 0.40.2
It is fixed with 0.40.2 
I ran into the same issue. It’s a bit tricky to change the port from 8883 to 1883 because I would have to flash new firmware to all my switches and mqtt lights. I managed to use the certificate setting to get a connection to the mosquitto server but then again all my switches won’t connect because of missing SSL.
In the mosquitto config I have 2 listeners: one using a password file and another using certificate based authentication. My attempt to add a third listener failed with the error “Error: Duplicate password_file value in configuration.”.
Maybe somebody got another idea?
Cheers, Mario
Shortly after I wrote that you published version 0.41 and all my problems disappeared 