Worked on my OnePlus 8T running LineageOS with no gapps and using Fennec F-Droid for the browser. Could you have a useragent or extension[1] it didn't like? I know that on my PC, GNOME's Gitlab specifically required me to change my UA to get it to load while every other Anubis config I've come across has been fine. I do notice LKML's is using difficulty 4, though, which I think is higher than I usually see.

[1] Due to an unrelated bug in latest Fennec, I currently have all my extensions disabled or else all pages stop loading at all. Normally use uBlock Origin, Tampermonkey, etc.