Fixed position of image layer after Resize or Offset Map
While the image is not itself cropped, it is now at least shifted along
with the tiles and objects so that its position remains where it is
expected to be.
Thanks for noticing and reporting this! The report came in a busy time where I was struggling with a cough and about to leave for family visits, so I only noticed it again today.
You can find the fix in the snapshot builds (as long as you're not on macOS, I'll make sure those builds update again tomorrow) and it will be included in an upcoming Tiled 0.18.1 release. I hope the fix works for you.