@AveSatanas Just a ping to ask if you did the 6.1.0 test yet? I bought a used switch from someone who apparently updated to 6.1.0 immediately before I bought it (d'oh). Want to make sure N didn't throw new domains (or a static IP!) in the update before I connect this to wifi.
I'm running Ubuntu 18.04 with Cinnamon, I don't have this issue. It does sound like it's potentially related to your file manager though. Try copying with command line and see what happens?
although i ended up accidentally changing my nand with no way of going back bc i didn't know you needed a gamecube controller to restore it (i have a wii minus/1.1, which doesn't have gamecube controller support)
and if i find the sd card i have my NAND backed up on, i can not only restore the NAND if i solder the right part in, but i can also put my NAND on dolphin, then i can play dolphin online, like PMEX Remix or MKWii Riibalanced