TromboneChat

In Copland's Outdoor Overture, the trombone 1 part occasionally is written 8va. In this instance (bar 239):

the 8va is written over fifth-line A. But according to the score, the part is not octave-shifted until a beat later:


Do we read 8va as indicating the note underneath, or the note(s) to the right? Or is this just sloppy typesetting?

It's correct in the 2nd part:

As a general rule, the score is always right... until it isn't.