Yes, an actor may still be aware of all the other parts but typically not in as much detail as their own part. In the text, "slipshod handling" are key indicators that they possess some knowledge of the overall play but it's perhaps heedless compared to the knowledge of their own role.

#feedback noticed two errors under the answer in Q 4.2 - "case" should be "cast" (Translate to English section) and "guarantees" should be "guarantee" (Confusing Sufficiency section).