OST/Song on Season 2 Episode 22 of Boku no Hero Academia
It is still the ending song, Datte Atashi no Hero or 'Cause You're My Hero', only the instrumental version. To be precise, it starts playing at around 20:14 of the episode (where Yaoyorozu was crying) and ends right before the start of the ending song (the scene showing Deku, Uraraka and Recovery Girl). Here's a direct link to the part of the instrumental where it starts: https://youtu.be/Vz3cEODIlC4?t=35 This spans from 0:35 to 0:48 of the instrumental.