I did in fact create a bug report about it! Before SketchUp 2019 you had to choose a template, but with 2019 and later it is possible to start a new document without it being based on a template. I happened, by chance, to have done that last night, ran into some problems, was in a panic for a while because I thought it was a general problem. Then I found that documents started from a template didn’t have the problems, and also I noticed that your file was using the blank document as well.
So, it’s a problem that may have been around for a while, but hasn’t shown for many people because it is out of the ordinary to start a new document that is not based on any template.