Nope. Can’t duplicate that. Seems to work about as expected for me. Since you weren’t very specific I tried a number of experiments:
Dragged an image into a styled text page.
Previewed.
The file was copied to the files folder in the page’s default named styled folder.
Dragged that same image from the resources window into a Stacks page (the home page).
Previewed.
The image was copied to the files folder of the root of the site as expected.
Dragged an image directly into the Resources window.
Then dragged that image from the Resources window into the stacks page.
The image was copied as above.
I then moved the styled text page to the root directory.
Its images were republished to the folder styled_files.
The homepages images were moved to index_files.
That said, a lot of the code here (at least for Stacks) is brand new. I don’t doubt that you’ve found a bug of some sort.
But there are different code paths active for the Unsplash images. And different again if you’re using the resource-images through Stacks API Image Transform APIs. And probably different for Blog pages and a few other corner cases.
I’d suggest posting more specifics about how you’re using the image – and see if you can simplify the bug-inducing use-case so that no other complications might be interfering or confusing the issue. Then post the details you find.