I'm currently stumbling over an IMHO strange behaviour when trying to use a template from my plugin in the admin backend.
I followed the official docs and then created calendar.html.twig in my plugin's template directory.
now when I create a new page, I thought it would be possible to select this template as Page Template, but it does not work.
I can, however, create a file calendar.md in a new page folder, an then, in the admin, it looks like this:
- note that the type calendar is correctly displayed, and I can also see that the template is actually used when I look at the page, but: I can't select the correct template in the dropdown - my custom type is just not displayed there, so, saving the page in the admin is not possible, because it will be of a wrong type.
did I miss something here ?
