Markdown does not render in snippets

[petern3]

Describe the bug

Snippets that have markdown used to render the markdown cells prior to Marimo 0.16.4, but now aren't shown at all in the snippets tab. The issue is not present in the snippet description markdown cell; that is fine.

Before:

After:

This behaviour was introduced in 0.16.4. My best guess is that it was from this PR: #6583.

Will you submit a PR?

• Yes

Environment

Details

  "marimo": "0.19.11",
  "editable": false,
  "location": "",
  "OS": "Windows",
  "OS Version": "11",
  "Processor": "Intel64 Family 6 Model 170 Stepping 4, GenuineIntel",
  "Python Version": "3.12.12",
  "Locale": "--",
  "Binaries": {
    "Browser": "--",
    "Node": "--",
    "uv": "0.9.5 (d5f39331a 2025-10-21)"
  },
  "Dependencies": {
    "click": "8.3.0",
    "docutils": "0.20.1",
    "itsdangerous": "2.2.0",
    "jedi": "0.19.2",
    "markdown": "3.9",
    "narwhals": "2.10.0",
    "packaging": "25.0",
    "psutil": "7.1.1",
    "pygments": "2.19.2",
    "pymdown-extensions": "10.16.1",
    "pyyaml": "6.0.3",
    "starlette": "0.49.1",
    "tomlkit": "0.13.3",
    "typing-extensions": "4.15.0",
    "uvicorn": "0.35.0",
    "websockets": "15.0.1"
  },
  "Optional Dependencies": {
    "loro": "1.10.3",
    "pytest": "8.4.2",
    "ruff": "0.14.1"
  },
  "Experimental Flags": {}
}

Code to reproduce

No response

[mscolnick]

Thanks for the callout. It does look like in that PR you liked, I accidentally indented a code block unintentionally.

I will fix this up and add a more robust test.