TYPO3 Core

To reproduce

A) Edit record for start- or endtime values

1. Create or edit a page entry (or any other record that has start-/endtime fields enabled)
2. Set startdate or enddate to past or future
3. Save your changes (normal, without close this edit form)
4. Click on Close button (beside save button)

B) Open record with start- or endtime values

1. Open existing record with given values for start- or endtime
2. Close edit form for record, without any changes

Expected result

Frame with edit form switches to the view you had opened before

Actual result

Modal dialog with warning Do you want to quit without saving? appears.