Hi. I just want to report that the tests that were supposed to ensure that nothing changes didn't work. I was doing fixes to templates that expected different structure from images (File:). Example fix for a template and see also removed CSS that was problematic. As you can see the template targeted a span element. Previously markup generated by File: didn't contain span and so the rule `.detail > span > span` targeted a span added to the template. After rollout the image was rendered with a span element and that span was wrongfully stretched to 100%.
Was this a wrongly constructed template and CSS? Sure, probably not forward thinking enough. But Wikimedia projects quite old. There were a lot of things that made sense 10 years ago.
I'm not saying you should abandon this deployment, but I am saying you should put it on hold. You should at least announce such changes, say when will the rollout be. I don't recall it being in Tech News, it should have been announced there. Needless to say, it was quite annoying that I had to quickly correct these templates without any notice. If there was any information, I wouldn't have to at least wonder where these problems came from.
That being said, I understand there's been a lot going on lately (Vector'22). And I know it is not feasible to render all pages in all projects.