The new Nexus Mods app adds collections creation, library searching and more improvements
(www.gamingonlinux.com)
Multi platform apps often do a shoddy job of fully and/or properly supporting linux, this is very common.
So common that WINE and Proton exist, to just reroute around that problem without forcing every software dev to also become a linux software dev.
The NM is yet another example of that, its honestly not even really remarkable, its to be expected from devs that are entirely used to developing on windows.
Do some linux devs also do a bad job of properly supporting a full array of DEs? X11 vs Wayland?
Yep, that's pretty common as well, this is why many serious distros at least attempt to pick sets of prebundled software, that work best with the DEs and WMs they support fully support, or even develop their own apps, or contribute to apps they like, such that the overall user experience on their distro is less janky and more congruent.