Mermaid AI produces flow charts even when C4Context is specifically requested

[rough68fish]

Describe the bug
I ask the Mermaid AI for a C4Context diagram and the output is a flowchart

To Reproduce
Steps to reproduce the behavior:

1. Enter "create a C4Context diagram for a photo upload service" into Mermaid AI
2. Results:

flowchart TD
%% External User interacting with the system
    user(["User"])
    
%% System Boundary
    subgraph PhotoUploadService ["Photo Upload Service"]
        direction TB

        %% Components within the system
        web["Web Application"]
        api["API Gateway"]
        auth["Authentication Service"]
        storage["Photo Storage Service"]
        db["Database"]
    end

%% Interactions
    user -->|Uploads Photos| web
    web -->|Calls API| api
    api -->|Validates with Auth Service| auth
    api -->|Stores Photos| storage
    api -->|Interacts with DB| db

Expected behavior
I expected the generated visual to be a C4Context diagram.