[ankit2235]

The Markdown backend called .strip() on code block content, which removed the leading indentation of the first line while later lines kept theirs. The relative indentation changed, so the code itself was altered: an indented YAML snippet changed structure, and an indented Python snippet no longer parsed.

This trims only blank lines before the code and whitespace after it (lstrip("\n").rstrip()), keeping the first line's indentation. It is the same trimming PR #3891 applies to HTML <pre>. Code blocks whose first line is not indented are unchanged, and whitespace-only blocks are still skipped.

The new test covers a fenced block, an indented (non-fenced) block, and a fenced block that starts with a blank line (which is still dropped). It fails on main and passes with this change. All existing Markdown groundtruth tests pass unchanged.

Issue resolved by this Pull Request:
Resolves #4485

Checklist:

• Documentation has been updated, if necessary. (not needed)
• Examples have been added, if necessary. (not needed)
• Tests have been added, if necessary.

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[PeterStaar-IBM]

lgtm!