Blocks lose image file name

My app shows a small Canadian or US flag picture in an image component on opening a screen, depending on whether the user has chosen Canadian or US settings. The Screen.OnOpen blocks are “from FlagSS set Picture to cdn.jpg” and “usa.jpg”, referring to 2 downloaded pictures in assets. Almost every day, I get two error messages per screen, there are blanks instead of the file names, and I have to re-enter them.

I have the same issue !