Can anyone speak with any authority about the following potential misprint?

Villa-Lobos: Fantasia

Mvt. 3; 2nd measure of Rehearsal #3 (beats 4 and 6):
The accompaniment is playing concert Ab throughout the entire measure, as well as during those beats. The B Natural (written pitch) seems like it should be lowered to Bb.

Any thoughts? Thanks.

Joren Cain