Mainly the post #19 from fnord Mwan3 after update not working .
I remember I tinkered a bit at first, trying also the modifications from post #20 while keeping my existing config but it only started to work once I started to configure from scratch again.
If I read the thread correctly the modifications described should be provided by updates in the meantime, but it probably doesn’t hurt to take a look at the scripts directly if it still doesn’t work with a new config.