System prompt becomes empty when using AWS Bedrock with Claude 3.7 Sonnet

[void110in]

What happened?

I have a preset that I've been using for a long time. It was working normally with the Docker image from February 25.
On April 5, I pulled the latest Docker image and confirmed that there were no changes to the .env file, but as mentioned in the title, the system prompt becomes empty.
Below is an excerpt from CloudWatch Logs:

{
    "schemaType": "ModelInvocationLog",
    "schemaVersion": "1.0",
    "timestamp": "2025-04-06T02:07:44Z",
    "accountId": "<aws account id...>",
    "identity": {
        "arn": "<iam arn...>"
    },
    "region": "us-east-1",
    "requestId": "<request UUID>",
    "operation": "ConverseStream",
    "modelId": "us.anthropic.claude-3-7-sonnet-20250219-v1:0",
    "input": {
        "inputContentType": "application/json",
        "inputBodyJson": {
            "messages": [
                {
                    "role": "user",
                    "content": [
                        {
                            "text": "<user input text...>"
                        }
                    ]
                }
            ],
            "system": [],
            "inferenceConfig": {
                "topP": 0.92
            }
        },
        "inputTokenCount": 33,
        "cacheReadInputTokenCount": 0,
        "cacheWriteInputTokenCount": 0
    },

I tried using the Docker image from around 2025/2/25, which was working normally before:

{
    "schemaType": "ModelInvocationLog",
    "schemaVersion": "1.0",
    "timestamp": "2025-04-06T02:12:32Z",
    "accountId": "<aws account id...>",
    "identity": {
        "arn": "<iam arn...>"
    },
    "region": "us-east-1",
    "requestId": "<request UUID>",
    "operation": "ConverseStream",
    "modelId": "us.anthropic.claude-3-7-sonnet-20250219-v1:0",
    "input": {
        "inputContentType": "application/json",
        "inputBodyJson": {
            "messages": [
                {
                    "role": "user",
                    "content": [
                        {
                            "text": "<user input text...>"
                        }
                    ]
                }
            ],
            "system": [],
            "inferenceConfig": {
                "topP": 0.92
            },
            "additionalModelRequestFields": {
                "top_k": 5,
                "system": "<preset system prompt...>"
            }
        },
        "inputTokenCount": 3472,
        "cacheReadInputTokenCount": 0,
        "cacheWriteInputTokenCount": 0
    },

As you can see, the additionalModelRequestFields appears to be missing.

I haven't checked the source code changes yet, but this behavior seems like a bug.

Version Information

❯ docker images | grep librechat                       
ghcr.io/danny-avila/librechat-dev            0551a562d80ddb6430a4935b71b067bd9ad938a2                           9fee531cfbc2   26 hours ago    920MB
ghcr.io/danny-avila/librechat-dev            latest                                                             9fee531cfbc2   26 hours ago    920MB
ghcr.io/danny-avila/librechat-dev            1e625f755708ec98e5adfb81e4deaecdc0e31e95                           bc401a882293   6 weeks ago     873MB

Steps to Reproduce

1. Use LibreChat with AWS Bedrock configured for Claude 3.7 Sonnet
2. Create a preset with a system prompt
3. Pull the latest Docker image (from April 5, 2025)
4. Attempt to use the preset with Claude 3.7 Sonnet
5. Check CloudWatch logs to verify that the system prompt is missing from the request

What browsers are you seeing the problem on?

No response

Relevant log output

Screenshots

No response

Code of Conduct

• I agree to follow this project's Code of Conduct

[danny-avila]

I recommend using Agents as a successor to presets, which bring in more capabilities.

https://www.librechat.ai/docs/features/agents

Also, it seems the preset issue is not happening to me, it is not disappearing. Some of the parameter fields may have change that would cause the issue, but making a new one from scratch would work.

Also, export the preset to help us confirm that's what happening.

Here is my export, working preset:

bedrock_[END].json