I threw together some files:
https://drive.google.com/drive/folders/1QDga5K2FGQ0q6BPh23A3DJE0lRKeGb6b?usp=sha...
I wasn't using any color management settings off of default, and cycling through those didn't change the outcome. I ended up trying different unwrapping techniques, and different texture bakes and texture set sizes, and I found that the problem mostly shows up when SP is set to 4096 texture scale, creating a few hard pixels along the seams. Granted this filter is advertised for LQ textures (and looks great for that), I was just used to working at a higher map size.