In my case, the card is detected OOB in catalina 10.15.2 BUT i have 2 issues:
1. Able to connect to 5GHz network, but max speed is less than 1mbps.
2. Unable to connect to 2.4GHz network - keeps asking for wpa2 password.
So frustrating.
I have this same issue on Mojave 10.14.6 (on a HP 8300 MT). I thought the problems were fixed when i switched the card to a different pci-e slot maybe a year ago, but when i got a new router i noticed this problem. Also when running network diagnostics i got a kernel panic. Ugh. Trying to find a solution now.
Apparently it uses Broadcom BCM4360KMLG (as mentioned
here) so it should work even in Big Sur since it's found (well BCM4360 without KMLG as far as i was able to find) on many macs that are supported.
I'm thinking if this has to do with a) some kext mismatch b) wrong setup in config.plist c) smbios (i'm using 13,2). Since it's mostly working maybe it's not using BCM4360 driver or the correct layout id etc for it but i don't know how to find out or troubleshoot this properly.
/// UPDATE ///
I switched some pci-e cards around and now it works properly! Funnily had to move it from x1 to x16 slot cause my gt710 heat sink is big (it went to the x4 slot) and that's the only option.
I also tried airportbrcmfixup.kext as the driver before switching slots and it didn't make a difference. I think it uses the same driver anyway natively, it just get's it from the OS's native driver package. One thing it did change was Card Type in system information from Third-Party Wireless Card to Airport Extreme, but that's just cosmetic probably.
Oh and the kernel panic happens if you run Wireless Diagnostics and make it do the report. That seems to be the case for others with working builds as well so seems it's a hackintosh thing. Might be just a Mojave thing though, cause my laptop with Sierra didn't panic. But that's of no importance, just a curiosity
.