Paste as new image uses the full canvas instead of just the copied selection

Environment/Versions

• GIMP version: 2.99.14
• Package: https://download.gimp.org/gimp/v2.99/windows/gimp-2.99.14-setup.exe
• Operating System: Windows 11 22H2

Description of the bug

In previous versions of GIMP, when you copy part of an image (ctrl+c) and then paste as a new image (ctrl+shift+v), it would create a new image of just the copied selection. In 2.99.14, the new image has the entire canvas area of the original image. I don't know if this is on purpose, but it seems like a regression to me.

Reproduction

Is the bug reproducible? Always

Reproduction steps:

1. Open an image
2. Select part of an image
3. Copy the selection (ctrl+c)
4. Paste as a new image (ctrl+shift+v)

Expected result: New image of just the copied selection.

Actual result: New image of the entire canvas area of the original image and the copied selection in place.