Why does CE hide a directory named 'apt' derived from a rename?

Using 11.1.2, in Project Files view, on a Maven project.

I click right on the icon for src/site, ask for new/directory, and enter 'apt'.

I typo, and accidently type apr.

I click right, select refactor/rename, rename to apt.

Success, but the tree collapses, and when I open it again, no apt directory.

I restarted the IDE, and *still* no apt directory.

It's there in the file system, what gives?

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