[halz]

On a whim, there is a nuanced situation with some Realtek (RTL8671B) bluetooth firmware on Linux that is 'solved' by downgrading firmware version. This random gist has a nice thread https://gist.github.com/peteristhegreat/b48da772167f86f43dec... ..and this fellow Nix wizard has the downgrade expressed in a nix config: https://github.com/Arroquw/nixos-config/commit/9d90d7d659e74...

I too was experiencing odd/erratic pairing issues with DualSense controllers and this RTL8671B based dongle, and using the older firmware entirely fixed it. Now four controllers can be connected simultaneously without issue.