When I fulfill some objectives for other missions, do I have to repeat them after I die and start on a checkpoint despite fullfilling the objective before reaching that checkpoint?

On the school level with Reiko Takato I hid the little girl on the closet to fulfill one of the objectives. After taking that key on the faculty that cutscene to fulfill the objective started. Now I died later and started on that checkpoint on the faculty. However after taking the key again the cutscene didn't play out.

Does that mean I have to hid the girl again on the closet or do I have to restart the whole mission?