Procedural Foliage doesn't fill the volume

The Procedural Foliage Volume doesn’t fill with trees anymore. The volume is large, 100000x100000, but it was OK in 4.8.3. In 4.9 Preview it only fills around the player, which is OK for optimization, but the distance is too close to the player. Trees can be seen appearing in the distance as you walk. Is there a way to increase the distance that the trees will spawn? Thank You

I may have solve the problem unintentionally. I was getting a few warnings when I cooked or launched.

One warning was for the material in Hilltree_02 from the Kite demo which I’m using in my procedural foliage.

M_CustomDepthBillboard was getting a warning from the TransformPosition node. It was using a Constant, so I change it to a Constant3Vector and the error went away.

Then a noticed that the trees fill the volume as they did in 4.8.3

So maybe there is a bug in TransformPosition not accepting a constant in 4.9