Help me debug (deeply) why clicking a quest it doesn't prioritize it anymore

[tobindax]

It's like the layer strata is actually detected when the cursor covers over a quest objective (or its circle with a number) but clicking on it does not switch to prioritizing that quest so it makes it unplayable for looking at quest objectives on the map.

I have a lot of addons and a hard time pinpointing which one specifically does it (or a combination of them) so I'd really like some expert debugging info from devs of addons on how they would debug something obscure like that.