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67d34a1
(Get the code!)
There are two different chip versions: rtl8761btv and rtl8761buv. 'btv' is UART attached, 'buv' is USB attached. Kernel 5.15 is correct in that it loads the 'bu' firmware for your USB dongle. 5.13 is wrong. But might be that the firmware blobs are named incorrectly. Need to dig some more and probably get my hands on one of those dongles.