The song Friends from DR chapter 4 contains Don’t Forget Leitmotif at 1:07-1:12 (specifically, the “I’m with you in the dark” part of don’t forget).
https://youtu.be/ZRo_i3hCN98?si=B4QtFhMhOe6u4upk&t=67
It’s pretty clear if you listen to it, and should be added to the Leitmotif wiki page under Don’t Forget.
If no one opposes, I will add it to the page tomorrow.