TYPO3 v10 - Why is custom CE CType not shown in Backend pageview?

I have a custom content element in a TYPO3 v10 installation. It works just fine - except one thing.

When creating a TYPO3 standard content element it's type is shown above the headline in pageview in backend. In my content element only the headline is shown - but not the type.

It would be nice to have the type shown above the header. Like the "Text & Media Element" label as shown in the screenshot. How can I achieve that?

It's best seen on this screenshot:

I already looked up the documentation, but didn't find a solution.

Additional info: first I had the problem that the icon in this view was always the default ce-text one, although I configured the "content-map" one from the core icons.

I could fix that by adding $GLOBALS['TCA']['tt_content']['ctrl']['typeicon_classes']['my_ext_map'] = 'content-map'; to EXT:my_ext/Configuration/TCA/Overrides/tt_content.php

Maybe that relates?

This can easily be done via a hook which is described in the second part „With "Classic" Page Module“ of the above mentioned „Configure Custom Backend Preview for Content Element“. I'm using this with nearly all of my own content elements.

I'm adding the icon the same way as you, but with a custom icon. There should be no interference.