A6b+ should be A6b1+

[OJCubing]

A6b) The competitor is responsible for stopping the Stackmat timer correctly.
A6b1) If the timer stops before the competitor has solved the puzzle and the timer shows a time strictly below 0.06 seconds, then the attempt is replaced by an extra attempt. A competitor forfeits the right to the additional attempt if the WCA Delegate determines that the timer was stopped deliberately.

A6b+) EXPLANATION The arbitrary value of 0.06 seconds was chosen to accommodate concerns about Stackmat timer malfunctions.

This guideline pertains to A6b1, not to A6b. Arguably it also pertains to A6b2 as well, but only as a direct result of A6b1, which is much more applicable.