Dalle rejecting prompts generated by Gpt-4

I am trying to make Gpt-4 generate prompts for Dalle, based on some article content. The prompts generated by Gpt-4 look fine to me, but too often Dalle rejects them with an invalid_request_error (“Your prompt may contain text that is not allowed by our safety system”).

I tried to give a system message to Gpt-4, asking it to make sure the prompt it generates is within the safety guidelines. Did not help much.

Even weirder: Entering the same resulting prompt in ChatGPT generates the image just fine!

Could it be that I am trying to generate German prompts? Could it be that OpenAI assumes German to be outside its “safety guidelines” in general (or at least more likely)?

Any input would be greatly appreciated!