Mask not working in-game

I have setup a square image as a child of a puzzle piece image(mask).
In the editor it’s just like i expected i got this result:

But when i click play and enter game mode, the mask just isn’t working:

Do you guys know what could i be doing wrong?
Thanks in advance for the attention ^^

of course, here it is.

This thread can be closed, i haven’t managed to fix it, but i will no longer need it. ty.