Applying Kustom

I've just stumbled across klwp, it seems to be capable of faszinating things, but it doesn't apply on my phone. S21, using nova launcher prime, every time I want to use it, it gets overwritten by the Samsung default background. I just updated to one ui 4.0/android12, and this is frustrating, since I payed for It. Other live wallpapers do Apply, only kwlp doesn't. I don't know why that is, in some thread the samsung support suggested that this is a third party issue, so if anyone could help me I would be very grateful. Have a nice day