TYPO3 Core

This issue seems to affect TYPO3 13.2.0-dev but not TYPO3 12 as far as I can tell

Steps to reproduce¶

1) Create a new page
2) Page Module > Create a CE in the "default" column
3) Page Module > use the icon on the top right corner of the "default" column (title: "edit this column"); it will load a form where all the CE in the column can be edited at once
4) edit something on the CE and click close; choose to save the CE (or click save and then click on the close icon)

Result¶

The whole TYPO3 backend is loaded inside the main content area of the backend