Texture bombing/splatting doesn't work in the landscape material with VRTs

I was hoping to create an easily extendable system for landscape materials. I started by creating a base layer as a material function:


Which makes creating the specific layers easy. also as material functions:

That allows me to set up the landscape material and its layers easily:

However, while the bombing works in the function’s preview…


… the landscape is as orderly as ever


Update 2024-03-02

Tiling works now, it just… randomly started to work, beats me.
However, I tried utilizing virtual runtime textures for a boost in performance, and with VRTs enabled, the bombing just… ceases to work.

Here’s the updated material, as a paste since the graph… grew: LAM posted by Angius | blueprintUE | PasteBin For Unreal Engine

Here’s the fragment that handles RVTs:

and a video of the issue: https://assets.erronis.games/UnrealEditor_fl7phi0kbF.mp4