Error message unable to save changes for "Edit in Topaz Photo AI" when using MacBook photos

After further testing it’s also NOT due to a maximum size as the exact same pattern can be seen with photos from my Sony alpha which are at 4000x6000 resolution and even a little cropping by few pixels is sufficient for the save back process to work.

I now found out that not only cropping, but any edit in Apple Photos before you select the Edit in TPAI option is enough and then you can successfully save the edits in TPAI back in Apple photos.
It’s really strange that this only happens with portrait oriented images, though.

Maybe this can help to isolate and solve the problem.