I also found alot of issues with the repeater function which isn't a issue on 4.8 MTK SDK, 4.8 op24 has issues especially on the 5ghz band, I think it tries to connect to fast maybe double tries to authenticate where the AP blacklist it 2.4ghz works better, but it seems i also managed to get myself blacklisted for to many authentication attemps.
Tested on MT3000.
Edit:
Also it seems to appear on Slate7 firmware 4.7.3 but I think it is a different error, it's getting stuck on the channel saying the channel already exists and then proceeds scan looping.
The AP i connect to is using multi psk with wifi-station and wifi-vlan sections (radius) with 802.11r I made fixes to make sure the free roaming incompatibility doesn't impact much with the 4 way handshake by tweaking the reassociation deadline, but maybe these specific settings break alot of gl routers for connecting on my ap, other devices just connect fine.
My config as uci-default is here for a gl dev to test what could potentially break it, both aps use channel 100 and 108 on 5ghz.