Today I received an(other) email from Google reporting "New Mobile Usability issues detected for site".
On checking in GSC, the error "Clickable elements too close together" is reported for three pages (including the Home page), and "Content wider than screen" is reported for the Home page.
All three pages have shown "Page is mobile friendly" in Google's mobile-friendly test since Google first introduced it, and did when I checked again this morning: the GSC reported error isn't apparent if I use Google's own tool to check it.
Because all content scales with screen-width it isn't possible for "content to be wider than screen". The only clickable elements anywhere near each other are in the breadcrumb-menu, which is intentionally formatted so that elements are not too close together on small screens (even with line-wrap on screens narrower than 300px). Nothing has changed in page-width/content-resizing settings or navigation-button layout - and anyway this is the same on all pages, not just three - since 2018.
One might speculate on what could have caused this - did googlebot fail to retrieve the CSS file on the last crawl? Is it a SIgn that we should inline everything? - but from here it looks like GSC glitches, not page errors.
The issue I reported in September ([webmasterworld.com
]) is also still showing as an error in GSC, although it was "fixed" on 15 September.
I'm not sure I would find these auto-generated messages useful even if something actually needed my attention. Does anyone know how to turn them off?