ZIP Recipe- adding new recipe impossible

I have been using ZIP recipes now for a long time and didn′t have any problems. But today I cannot add a recipe to a new blogpost.

I did as I always do: create the recipe. Then write a blogpost. Click on the block for adding a ZIP Recipe. selecting the already created recipe from the dropdown list. But then: nothing happens!

Ususlly the recipe shows up in the Block editor, but this time, there is nothing. I tried to see the preview but there is none either. Of course I restarted wordpress, restartet my laptop and all that. But it doesn′t work. Does anyone have an idea?

Thanks a lot in advance!

The page I need help with: [log in to see the link]