Assigns Recall for scenes

Hi folks

Just need to get this sorted before 2020…
I’ve been finding that assigns for channels to outputs aren’t saved in scenes. So I recall a scene and everything is recalled except the few channels I had UNassigned to LR from the previous gig (Their unassigned state persists).
Is this a known bug or which filter are they included in? I’m pretty sure I’ve ruled out the filters I have in the scenes I’m saving to and the global ones…
Happy new year in the meantime

On the scene menu look the “safes” tab. Safes are a global filter for all scenes.

Found it.
It was the LR mix safe tab (on the second page)