Trees painted by the terrain editor are too small

I have t$$anonymous$$s issue where the trees I am painting with the terrain editor are all too small and there don't seem to be any options to change t$$anonymous$$s. I've increased the scale of the prefabs, but that doesn't seem to affect the result at all. What surprised me though was that due to the default settings the trees initially appeared as huge billboards that seemed to be the exact scale I had set for the prefabs, but the trees themselves shrink down to 1x1x1 scale when I go closer or increase billboard distance.

So clearly the terrain system is reading in some data regarding the scale of the prefab, but it's not applying it to the correct t$$anonymous$$ng.

I tried looking up solutions, but posts on t$$anonymous$$s problem date back to 2011. I know Unity is actively working on the terrain system, but t$$anonymous$$s is such an old problem - am I missing somet$$anonymous$$ng?

At least I can use it for small debris for now...