Edit: It really was an issue with my mouse, I put it to pasture.

Constantly when I try drag & drop on Dolphin & Firefox, the dragging stops mid-way before I stop holding left click, it’s a showstopper for me using KDE. I found others have this issue as well but is there anything I can about it? I’m using Wayland, NixOS, and a Logitech G604 mouse.