Thank you for the post.
I am able to replicate with FileMaker Pro 13 (Advanced) for Mac OS X. FileMaker Pro 13 (Advanced) for Windows is not affected.
Additionally, I forwarded a report to Testing and Development for review.
An entry in the Known Bugs List has been linked to this Issue Report. Any Comments/Questions/Suggested Corrections should be posted here or in a new thread. Please do not post such comments to the Known Bugs List thread.