I've never had any issues with #Solaar working (I've had other issues with it, but it's always done it's job very well!). Until now, when I installed the #flatpak version. It did not work at all, it did not find the receiver. I did try installing Flatseal and toggle the relevant looking switches, but no luck. Uninstall, install the regular version of it, and yeah it's working!
So, I love flatpak! But those apps that are unusable as flatpaks, what's the point of having them on #Flathub?