Darkmode and Nanospace theme

First of all, great plugin.

Now, I am currently staging a site with a new theme and I opted to go with Nanospace since it is relatively minimalistic, however I have run into trouble with Darkmode on this theme in particular.

The theme has a header image that will get inverted, even though the image itself has the darkmode-ignore added by the plugin.

Also in an archive view, the featured images look correct except if you mousehover over an article, the hovering will invert the image again.

I have tried multiple things, including adding the z-index to the header container, which works great for the colors but it will obstruct the main menu on top. I have tried going into the CSS and checking the sourcecode, but I cannot figure out how the inverted colors are assigned and I cannot prevent it from happening.

Did anyone else have success with custom filtering specific images or parts to not get inverted by darkmode?