Can you please let us know if the deleted library is by chance the Default Image/Video/Document library.
We have tried reproducing the problem on a local Sitefinity 5.3 project, but have not been able to replicate it locally. Can you please take a look at this sample video
we've recorded and let us know if we're not missing an important part in reproducing the issue?
Sitefinity versions previous to 5.4 had a bug related to deleting the default library for media content, resulting in similar behavior to the one described. In the second part of the above linked video I've demonstrated this behavior. If that's the case, the bug has been fixed for our Sitefinity 5.4 release, and upgrading
to that version should bring the designed functionality.
the Telerik team
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