functionResponse: Unable to submit request because it must have a text parameter.

[LaKing]

Description of the bug:

According to the documentation the results to the tool function calls should be submitted with the functionResponse, where response is a json object.

                              const submit = await chat.sendMessage([
                                    {
                                        functionResponse: {
                                            name,
                                            response: { content: "output" },
                                        },
                                    },
                                ]);

Here name is a valid string, and "output" is obviously a valid string. Therefore, I assume, this is a bug.
I have extensively looked up all documentation, examples, and this should work, .... but I'm unable to send back any results to the model.
I have tried this within the response stream, and also by collecting all results and sending them once the stream completed.

Error: [GoogleGenerativeAI Error]: 
Error fetching from https://generativelanguage.googleapis.com/v1beta/models/gemini-2.0-flash-exp:streamGenerateContent?alt=sse: 
[400 Bad Request] Unable to submit request because it must have a text parameter. 
Add a text parameter and try again. 
Learn more: https://cloud.google.com/vertex-ai/generative-ai/docs/model-reference/gemini

[randofan]

I'm encountering the same issue with function calling. Running this as part of an express.js server, it works perfectly on localhost using the Firebase emulator, but this issue arises when deployed with Firebase functions. Once I see this error message, any subsequent messages (including non-function calls) result in the same error.