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HTMLSectionSplitter leaks #TITLE# metadata and raises KeyError when parent metadata has no Title
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### Submission checklist
- [x] This is a bug, not a usage question.
- [x] I added a clear and descriptive title that summarizes this issue.
- [x] I used the GitHub search to find a similar question and didn't find it.
- [x] I am sure that this is a bug in LangChain rather than my code.
- [x] The bug is not resolved by updating to the latest stable version of LangChain (or the specific integration package).
- [x] This is not related to the langchain-community package.
- [x] I posted a self-contained, minimal, reproducible example. A maintainer can copy it and run it AS IS.
### Package (Required)
- [ ] langchain
- [ ] langchain-openai
- [ ] langchain-anthropic
- [ ] langchain-classic
- [ ] langchain-core
- [ ] langchain-model-profiles
- [ ] langchain-tests
- [x] langchain-text-splitters
- [ ] langchain-chroma
- [ ] langchain-deepseek
- [ ] langchain-exa
- [ ] langchain-fireworks
- [ ] langchain-groq
- [ ] langchain-huggingface
- [ ] langchain-mistralai
- [ ] langchain-nomic
- [ ] langchain-ollama
- [ ] langchain-openrouter
- [ ] langchain-perplexity
- [ ] langchain-qdrant
- [ ] langchain-xai
- [ ] Other / not sure / general
### Related Issues / PRs
Related: #38140 was an earlier submission of this report that was auto-closed because it was not submitted through the web issue template.
### Reproduction Steps / Example Code (Python)
```python
from langchain_core.documents import Document
from langchain_text_splitters.html import HTMLSectionSplitter
html = """
<html>
<body>
<p>Intro before header.</p>
<h1>Header</h1>
<p>Body.</p>
</body>
</html>
"""
splitter = HTMLSectionSplitter(headers_to_split_on=[("h1", "Header 1")])
print("split_text output:")
for doc in splitter.split_text(html):
print(f"content={doc.page_content!r}")
print(f"metadata={doc.metadata!r}")
print("\nsplit_documents output:")
try:
splitter.split_documents(
[Document(page_content=html, metadata={"source": "example"})]
)
except Exception as exc:
print(f"{type(ex…
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