I saw the below screen on my phone earlier and shared it with the team. It went away on refresh and I couldn't reproduce it, but wanted to check that no one else was seeing it.
@maestromac responded with, "looks like FOUC."
I had no idea what that meant but on a quick search, realized that it stands for "Flash of Unstyled Content."
Straight forward enough, but what an acronym! How is it even pronounced?!