GL-MT1300 Beryl - 2.4G WiFi not visible or not working

Update: Occurs in USB tether, MR1100 in IP passthru feeding Beryl. Issue has been reproduced; I even did a factory reset, did not resolve Beryl not broadcasting 2.4G SSID. When I switch the MR110 to supply the Beryl via Ethernet, still in IP passthru – all is well and both 5G and 2.4G SSIDs are broadcast. Finally, and likely related, I get frequent disconnects with my LTE internet on a plan and location that has proven reliable, but only with the Beryl in IP passthru. Same USB tethering setup to my trust Mango, is fine as is Beryl using Ethernet connection. Is there a formal way to submit a bug?