The issue has been fixed with Apple’s MacOS High Sierra 10.13.4 Beta (17E139).
You can try out the fix by updating your machine to the beta update from Apple.
Let us know if the issue is fixed for you after aforementioned High Sierra beta update.
An error occurred while saving the commentAnonymous commented
I'm experiencing the same thing. I have to take the extra step to copy to desktop and then package. The bug needs to be fixed, ridiculous to have to take that extra step. Don't upgrade to High Sierra!!!!