Windows Lock Screen custom picture not working

Hi,
I'm running 24H2 and have changed the lock screen image to one of my photos having the same dimensions. If I type the Windows key and L, the photo is shown correctly, however, when I start the PC, the lock screen is always the default blue folding image. I know it's not really important, but is there a workaround I can use to make the lock screen always show my photo, please?

My impression is Settings will sometimes forget to update all the necessary reg values.

So I wrote a batch script to force it to work.