I have had my WiFi broken by updates many times, and what worked for me every time was to flash previous known-good DTB and DTBO. Use aml-flash-tool as described here. You don't need to follow all the steps, for me it was enough to:
1. Turn on wade while holding the side button (to enter AMLogic burn mode)
2. ./update bulkcmd fastboot
3. fastboot flash dtb dtb.img
4. fastboot flash dtbo dtbo.img
5. fastboot reboot
The DTB/DTBO files I use are from lineage-19.1-20221023-nightly-wade-signed.zip
Thanks @sjustinas - much appreciated and sorry for getting back so late to you (I was on a business trip).
I tried now to get the DTB(O) files according to your description (which seems to be for Linux, including the tool). Very sadly, I only have Windows (10) available. Would you mind guiding me to a tool (and respective commands) for Windows? Thanks a lot in advance for your kind support again to get my box working again - very much appreciated!