Thanks for the update!! I was using the firmware rtw8821a for my wifi dongle and after updating to the latest test update, the dongle no longer works. I think it was probably the linux upgrade.
Would it be possible to add the firmware to LibreElec? I don't know if that could help with this issue. I was using the /storage/.config/firmware/rtw88 directory to manually add the firmware, but that no longer seems to be working. Also, I got the one I am using from this link