I can connect to one Bluetooth without issues using Bluedevil. When I try to connect a second device, Bluedevil keeps connecting and then fails (the first device keeps connected). If I use Windows, I am able to connect two devices simultaneously, so the Bluetooth adapter has that feature.
KDE Plasma: 5.19.5
KDE Frameworks: 5.73.0
Bluetooth adapter: Realtek RTL8822BE