After updating from Gridbox 2.16.2 to 2.16.2.1, the gallery from the Zero app is no longer displayed

After updating from Gridbox 2.16.2 to 2.16.2.1, the gallery from the Zero app is no longer displayed in the frontend.
If I go back to 2.16.2 with a backup, it is visible again.
Even if I turn on compression for CSS under Performance, the icons that I inserted in Button disappear.
Here is an example where the gallery is no longer displayed. But it is present in the source code. I have deactivated all settings for better performance.
https://cultro-monaco.de/handmachene-messer/kochmesser/santokufeder.html

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