My workmate created a stackblitz-example and i forked his stackblitz (deleted by now) to get the mat-icons working: https://stackblitz.com/edit/seeming-same-content-but-different-behavior-working
=> this link works. The only thing i changed is: Adding lines 2-7 in styles.scss
He could not reproduce this. So i wanted to show him what i did and so i tried to do it again. And now i can also not get the mat-icons working: https://stackblitz.com/edit/seeming-same-content-but-different-behavior-not-working
=> this link does not work
But i can not find any difference between them.
So, what is wrong in the second? Why are warnings in styles.scss in the not working example but not in the working example?