Strange behaviors in Ubuntu Maté (that troubled upgrade)

While I am delighted that you gentlemen are having such an engaging time discussing DistroWatch (for me, a tad less useful than Rotten Tomatoes), I want to go back and report I found the problem. Spoiler alert: the welcome screen.
I followed the spirit of @Akito’s suggestion to systematically test each of the changes I made, and ideally in the order they were made.
First, I changed the theme from Yaru to Traditional. No change (and it was the least likely).
Second, I changed compositor from picom/xrender to Marco None. None.
Third, I returned to picom/xrender and removed the welcome from its snap installation. BINGO! All three of the described problems vanished.
Now I know none of y’all like to address this question, but I’ll ask it anyway. Why did the Welcome screen do this?

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