Not really, plus you are conflating things. I never had an issue with WLAN cutting out on the rango back when I used the radios on the device. I am not talking about cessation of development, CC, WPA3 or any of the myriad of issues.
There are quite a number of voices saying they have no cutout issue with 19.x, but experience issue with 21.x.RC, so backup to version 19.x where things work. At any rate, for those that have the issue on 21.x.RC / master and might want to try the previous FW, you could try:
prev88W8964FW.sh
wifi down
cd /lib/firmware/mwlwifi
mv 88W8964.bin 88W8964.bin.ORG
#### 88W8964 firmware 9.3.2.6 -- 11896425a9fe6d576b52864d8d0945656db3d551
wget https://github.com/kaloz/mwlwifi/raw/11896425a/bin/firmware/88W8964.bin -O 88W8964.bin.TST
ln -s 88W8964.bin.TST 88W8964.bin
## for back to original
## rm 88W8964.bin && ln -s 88W8964.bin.ORG 88W8964.bin
wifi up
to see if it changes anything.
On setting the CC, there was a patch (I still have ti here), plus CC with the third radio was a well known issue, and resolvable if dealt with correctly, at least it WFM on a NA(CA) unit.