Mystery with Trash-Card

I use the Trash-Card from GitHub - idaho/hassio-trash-card: TrashCard - indicates what type of trash will be picked up next based on your calendar entries 🗑️.
Everything works smoothly on PC and tablet.
Unfortunately, the card is not displayed on the Google Pixel 7a. Everything else works perfectly on the Pixel.
Are there any special settings I need to make?

The display has been working since today. Why, I have no idea.