About Interruption Feedback in Edge and Face Selection

In some cases when automatic propagation is interrupted, a label appears at the extremity of the last selected edge.

Next?
Means that the maximum number of steps forward has been reached.
Angle
Means that the maximum angle is not respected or there is an ambiguity.
Tolerance
Means that the maximum gap is not respected.
Closed Loop
Means that the contour is closed.