symptom.whitespace

You pasted the field with a space on one end — out of a document, a chat message, or a variable that kept its newline.

What it means

Leading or trailing whitespace around the field, which the door refuses rather than trimming: nothing here silently rewrites text it did not author.

The mechanical pass reaches it: roadkeep lint --fix closes this one.

What closes it

• roadkeep lint --fix — the field is trimmed where it already sits, and no other byte moves