Ok so this is just weird. I tried installing it with Vortex, and it just worked. I removed the mods installed through Vortex and tried them again through MO2 and it worked. Had the same thing happen with SkyUI. Although that didn’t crash until i hit esc ingame.
I already replaced SKSE with the correct version, as i had doubts about that, before I posted. Didn’t matter. But I did some more searching and found that the GOG handles the plugin file differently than steam. And vortex has been updated for that, but i can’t seem to find anything about MO2 having done the same, so maybe that’s it?