If you had tried it you would have known. But yes, it does.
Here it is, group within a group. Nothing special compared with the examples above.
The dark red blob isn’t in a group. The hazy blue blob is in Group 1, and the rest is in Silhouette masking group.
If I make the hazy blue blob a “plus” layer, nothing happens, because it doesn’t have anything to interact with.
But if I change Group 1 from “normal” to “pass through”, it will let the modes of layers inside it pass through to the next level. (or previous, depending on how you see it)
