failed to load rtl_bt/rtl8761b_fw.bin

[lsg]

i have usb wireless dongle, it uses rtl8761b chip, it works in opensuse
but bullseye complains though i have installed non-free firmware-realtek:

[   16.123855] bluetooth hci0: firmware: failed to load 
rtl_bt/rtl8761b_fw.bin (-2)