Display without details won’t work anymore

After an update all events vanished. I had a backup of the whole site and installed it on a development server. Everythings works fine on this site: http://shop.diexperten.ch/termine/

On the website https://pferdezentrum-flawil.ch/termine/ I use the same short code
[event-list show_details=single_event_only]

But on the active website the details are shown.

Is there a new short code that I have to use?

Thanks for your support!

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