Bug Unity wont save a sprite in a list.

Hello dear unity forum members,

I have a list, I want to store sprites in them, but Unity doesn't want to save them when I press the play-button. Why? How can I fix it?

Here is the video where I showcase my problem:

Thank you,
Skyflamme.

 

Here is the code I forgot to mention: https://pastebin.com/85bZD2GZ

 

What happens if you actually save your scene after you add your sprite to the list before you click play? Because according to the indicator on the window header you aren't saving any changes before you play.

 

Unfortunately, same result.