Searching is suffering from various UI regressions. While usable, there are problems with the spinner showing when it shouldn't and the search in pages feature being squished:
{F27322777, size=full}
There are similar breakages in the media viewer:
https://en.m.wikipedia.beta.wmflabs.org/wiki/Albert_Einstein#/media/File%3AEinstein_1921_by_F_Schmutzer_-_restoration.jpg
and minor breakages in the languages overlay and visual editor overlay (T210640):
{F27322819}
= Post morterm
The regressions were due to some problems in the inheritance chain which meant the incorrect class on Overlays was being set. I've documented them in https://gerrit.wikimedia.org/r/#/c/mediawiki/extensions/MobileFrontend/+/476404 Overlays should respect inheritance chain when passing up options
This did not make the train so no SWATs are needed