Manjaro does not develop wifi firmware, that turns your issue a upstream issue, then It might be already solved upstream but the patch my not be here yet, then you have to find out if this could be resolved at packaging level after that you have to check if is a Manjaro maintained package or a Arch one to be able to report a bug in the correct place, its complex but that’s is how it works, however patched or not you still have a issue so it got moved to support section to see if there is a current solution to your problem.