Unioned parts with the ForceField material may not render properly if you overlay a texture on it.
A small workaround you can accomplish is by converting that negated wall into a mesh, and inserting your texture through the TextureID property once you import that mesh into studio.
Simply go to the negated wall in your explorer,
Right click the union
Find “Export Selection”
Save it to anywhere in your computer
Click on the Import 3D button in Studio.
And you can do the rest from there.
You will be given a MeshPart, and set it’s material to ForceField and put the texture in here:
I don’t really need a payment since it wasn’t too big a task. Here’s the file, I made the wall use a SpecialMesh so it also has a glow like the other walls: Forcefield_Wall_Hole1.rbxm (3.1 KB)