I managed to get Openwrt installed to my DIR-882 using this method D-LINK Recovery Mode (DIR-882 DIR-878 DIR-867)
Same issue with openwrt 21.02 on (Linksys WRT1900ACS)
macbook pro from 2012 not at all. But with new wifi card from apple model macbook 2018 and huawei p20 and above should works just after reconnect the wifi.
Channel 36, 42, 48 ...etc testes the same.