Niagara and Opacity Mask problem

I just started learning Niagara system and there’s something confusing me.
Few weeks ago I can use material with opacity mask in Niagara, but someday that material turned black only in Niagara. Is this a bug or did I missing some settings?
I use 4.22.3 and here’s the screenshot of my material and what it looks like in Niagara now.

Any help would be greatly appreciated!