NotebookEdit rejects insert with "File has not been read yet" after a partial Read

What happened

After calling Read on a notebook with a line range (offset/limit), a subsequent NotebookEdit call with edit_mode: insert fails with:

Error: File has not been read yet. Read it first before writing to it.

This happens even though the notebook was just read in the same turn.

Repro

1. Read(/path/to/foo.ipynb, offset: 70, limit: 110)
2. NotebookEdit(/path/to/foo.ipynb, cell_type: code, edit_mode: insert, content: "...")

Observed: error above.
Expected: insert succeeds, or the error message points to the actual requirement (e.g. "a full read is required" or "specify a cell_id").

Notes

• Workaround: re-Read the whole notebook (no offset/limit) immediately before NotebookEdit.
• The error message is misleading because the file has been read in this turn.
• Plain Edit on the .ipynb JSON works fine after the same partial Read, so the read-tracking divergence appears specific to NotebookEdit.

Environment

• Claude Code (CLI), Linux
• Opus 4.7 (1M context)