Horizontal screen lines with dark reader on specific websites

Hi I’m new to this forum and want to describe a bug but I’m not sure where to file the bug exactly. Not sure where the cause is possibly located.

So I’m on Fedora 40 and I experience strange horizontal dark lines on the whole screen whenever I am loged into the account page of epic games with the browser plugin “dark reader” enabled. It’s not happening on the login page but right after I’m loged in.

When I disable dark reader for that site everything is fine. But if its a bug in dark reader or the browser client I wouldnt expect it to affect the entire screen. It’s also not visible on screenshots so I thought it might be a bug in a plasma component.

I also comfirmed it can be reproduced with firefox, chromium and librewolf.

Any thoughts?