Image generation with Panther is often not possible

Whenever I want to generate images with a panther animal, I often get this message:

I’m sorry, but I was unable to generate images based on the given description due to our content policy. If you have another idea or a different scene you’d like to visualize, please let me know and I’d be happy to help create a new graphic for you.

There must be an error here. Why should it be problematic to create images with an animal like a panther?

Here is an example prompt: Create a graphic in which a panther animal jumps out of a cube.