Bluetooth some devices won't connect anymore

It seems like some of my controllers can’t be found through Bluetooth anymore. A new Switch Pro controller can’t be found via the KDE bluetooth manager (my old one can still be discovered and connects fine) as well as my 8Bitdo SN30 Pro+, which has previously worked fine.
Said new Switch Pro controller at least connects perfectly fine to my Steam Deck, even if it won’t connect to my desktop at all.

My best guess is that this is caused by an update to either the bluetooth stack or the kernel? Otherwise I couldn’t really explain why my 8Bitdo stopped working as well.
inxi -Faz output:

In many cases it helps to delete known devices and pair them again.

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it did not help in this case, I couldn’t even get to connect it for the first time at all.

As the link you gave above seems somewhat “fishy”, please, be so kind to post an output of this command:

inxi -Fxxc0z | eos-sendlog

Are you in dual boot ?