Did you see this topic? It appears to be similar (same?) to yours. A workaround is posted but there are other workarounds you can try.
Although this topic was for a Linux OS, the workarounds listed are pretty generic and can be tested on any OS.
External article linked in the above post that may be helpful.
Topic below is the most active topic per issues surrounding WhatsApp and may help.
I suggest you try the workarounds and see if any of them solve your issue. Post an update listing what you tried and the results even if the workaround did not work especially if anything changes.
You should also see if working in Brave Beta and/or Nightly. Brave may be working in the background on this issue and any fixes will probably be released in those versions first.