Help: 3D Voronoi causes seams upon export. How do I fix?

What it says on the tin, really.
When I use 3D Worley Noise, 3D Voronoi, and 3D Voronoi Fractal, the resulting export has nasty seams every time. Theory goes that all of the 3D noise will cause horrid seams.

I feel like I'm doing something wrong to cause this.

Included is how things look in Substance Painter, what the export to Unity looks like, and my export settings.

Please get back to me on a solution as soon as possible.

If it helps, I'm on the latest Substance Painter and AMD drivers as of writing [Dec. 2025].

This situation has been diving me mad, as it makes no logical sense, and I wanna put my computer out the window in frustration.

Thank you for reading.