When registering an MCP, if the '=' character is included in the args, it gets converted

When registering an MCP, if the ‘=’ character is included in the args, it gets converted.

{
  "mcpServers": {
    "Framelink Figma MCP": {
      "command": "npx",
      "args": [
        "-y",
        "figma-developer-mcp",
        "--figma-api-key=figd_***************************",
        "--stdio"
      ]
    }
  }
}

When you register it like this, the ‘=’ character in the args gets changed to “\u003d”.
Of course, it doesn’t work properly either. Is this a bug?