TYPO3 Core

This is a series of bugs caused by a special system condition. If necessary I can demonstrate this on a system.

Situation:

Given: page "A" with content in the page properties, Resources -> Media -> Image file. The page has the URL www.somewhere.com/A
The image file was removed by an administrator and counted as lost file.
To clean up the system, the according sys_files entry was removed as well.

So now when someone edits the page, instead of the image file there is a folder symbol with no information.

Now, when someone tries to remove that image from the page properties, he gets an error message and the image remains in the page properties.

Now someone decides to redo the page and creates a new page "A" which gets the URL assigned www.somewhere.com/A-1 and he copies all content.
Then as a last step, he deletes the original page "A" and changes the URL of the new page "A" from www.somewhere.com/A-1 to www.somewhere.com/A

And now something very weird happens: The new page "A" vanishes. It does self-delete.

This is very weird and can be very frustrating. I never experienced that before and I think this is caused by the missing file.