Six months later… I ran into an issue with Foliage not painting, and at first I thought it was my Z offset which had negative large numbers. They came off an asset pack and not sure why you would want -100 and -50 for trees, but that was not the issue.
In my case I had accidentally set scaling so that the minimum value was 3 and the maximum value was 2 and this caused the painter to think it was painting trees, the numbers by each SMF went up, but were not being painted, at least they are not visible. Correcting this fixed the issue.