After import, the preview state (or page count) will be the value of the imported material. This is wrong, the correct value is "Postponed" if the preview is switched off.
Discussion:
Q: The existing images should be deleted?
A: not necessary
Q: Does this problem also exist when uploading?
A: yes, but the solution is correct for this case as well.
Q: What is the right preview state if the preview generation started immediately (hint: the imported page count is not correct)
After import, the preview state (or page count) will be the value of the imported material. This is wrong, the correct value is "Postponed" if the preview is switched off.
Discussion: