Did you copy paste the receiver? Have you checked the receiver to make sure that it receives from the right sender?
Because there is this problem that if you just copy paste a receiver, the name is the same, but actually it doesn’t receive any signal until you reassign it.
Do you have scene render pass in your project?
Is this project an old project that you open in newer spark ar version?
My experience from the previous version, there is this annoying bug where after some action makes render pass patches broken, so we have to replace it with a new one that we put in manually again. (not copy paste)
if after you tried it and it is still not working, i have no idea what could be the main problem.