Odd screenspace dithering always present despite r_softemu being 0

[Terraformer9x]

I have no idea if this is intentional behavior or not but I assume it isn't.

I've noticed that Ironwail has always odd screenspace dithering going on despite r_softemu being set to 0.

Here's a screenshot, the resolution is 2560x1440:

It's very hard to notice unless you zoom in, so here's a zoomed in portion of the left wall in the above screenshot:

The oddity becomes more noticeable when r_scale is set higher than 0, here it is set to 3:

And here, r_scale is set to 6:

Again, I have no idea if this behavior is intentional and I can not find any cvar linked to turning off this weird dithering effect despite the engine advertising dithering as being something that's optional.

[OpenRift412]

Actually, this behavior is also subtly present in when r_softemu is set to 3. It isn't really present when cranking up the r_scale variable, but if you look closely at the weapons you can see a slight dither pattern in certain places.