I finally replaced the "temp" with "moho" and was able to open the latest version of the file I had been working with. I saved it as a new title. But as soon as I made another change and saved again, it lost its file name and converted back to a "temp" file.
What is going on? I've never seen this before.
Only thing I've done differently is update from 13.5.1 to 13.5.2.
Here's and image of the new files it creates. And it creates a new one each time I save, so there will wind up being hundreds of these.

https://www.dropbox.com/s/k5za78cp0l4li ... .png?raw=1