Unclear What sets the new hint and what it says is not known.
What
The footer is the line of hints shown under the input box. It used to appear for a fixed set of reasons, ending with the hint about expanding pasted text. It now also appears when a new first-row hint is set, so an extra hint can be shown there.
Why
This prepares a place for a new hint in the interface.
Something disagreesSomething we can check disagrees with this entry, or the writer said they could not settle it.
The writer flagged doubt
What sets the new hint and what it says is not known.