I suspect there are a few slightly incorrect guesses here. I know about as much as you do (really!), so most of this is based off stuff we've heard in public, or common sense.
The new site designs are based on Stacks, a unified library for all the designs. While Jin's old designs was quite beautiful, having bespoke designs for each SE site resulted in a ...
Code fences weren't supported until January 2019, so any post that used them before then had them rendered as simply inline code. You do need to edit and save in order for the post to be rendered using the new Markdown processor.
I'm a big fan of debugging things. The foreword to Painless Project Management mentions this, and is available online. An excerpt:
And so, on the Upper West Side of Manhattan, if you’re a restaurant,
and you want to thrive, you have to carefully debug everything.
You have to make sure that there’s always someone waiting to greet
guests. This ...
It was a bug in the CSS after all, due to the inspection. It felt like, as a website enthusiast, that the CSS that references the text in the positive rep which is green is overriding the text inside the special case for bounties which is white to avoid what happened today.
After I inspected, turns out it is the case, and the problem is now figured out. The ...