Bug: PBR blend textures are indescribably broken on latest branches

[lenship2]

Describe the bug

This is the default P2CE branch, last updated November 25, 2025.

This is the latest P2CE staging branch, but this also happens on unstable.

The only parameter that enables this behavior is the addition of blend textures through $basetexture2. Nothing else seems to affect this behavior, as seen in this video where nearly every parameter is commented out: https://youtu.be/F0nXfQ-0HnA

To Reproduce

1. Obtain a PBR blend material: blendtexturebug.zip
2. Apply it to a face
3. wtf is even happening?? like what?

Issue Map

N/A

Expected Behavior

Blend textures should look the same as how they are on P2CE's default branch.

Operating System

No response

[pivotman319-owo]

Directly related to #1640

[lunairekitty]

Oof, that's a crispy normal map in the second image 😂

Yeah, I noticed this issue too on unstable. Textures incorrect colors or black/grey like your image.