I can confirm this bug. It’s happening with Affinity Photo on Windows 10, too.
When opening an image from standalone TS2 (2.0.7) everything looks normal, i.e. crisp and sharp. Opening the very same image from Affinity Photo in plugin mode, the image looks very blurry.
One observation I made (maybe I read it here in the forum, too, but can’t find it right now) is that this seems to be just a display problem as long as you only apply looks and don’t change any setting by moving any of the sliders. When just applying a look and accepting the image it is still sharp in the host application.
But as soon as you change any setting - and may it be the slightest change - the blurriness is baked into the image and back in the host application you have a blurry image.
This does not occur with Studio 1.