Been noticing several times today that I'm unable to interact with pages on Wikitech because 1) they render in MobileFrontend, and 2) MobileFrontend seems to be suffering from a bug that causes an overlay to render by default on each page it renders on.
The latter results in the page being half-grey and also hijacks all click interaction (unable to search, expand, or navigate).
Current example url: https://wikitech.wikimedia.org/wiki/Incident_documentation#2019
Reproducible in Firefox, Safari and Chrome.