What broke
In a worktree pinned at an old commit, an untracked path means untracked at this commit; every reader had read it as absent from the repository — a register entry, a warning that three directories held the only copies of three journal entries, and then a whole mission contract, all on the false premise. Prose had recorded the lesson eight hours earlier.
The rule it paid for
Untracked entries are reported in two classes, and the report says what each means.