Seems to be reproducable currently until I go and clear the cache:
Showing as mobile theme on desktop, all other pages working fine.
All caching & minify is enabled except JS minify which causing issues with mobile theme menus I can’t resolve myself.
This really is a fucked situation where Google give better rank for having mobile optimisation & page speed, requiring basically a handmade site and caching – something that clearly doesn’t “just work” and requires paying someone to get setup. Just my 2 cents.