I was browsing Db wiki (yea i am stupid for doing that) and i stumbled on this .Fused zamasu is 3/4 Shinjin-1/4 Saiyan.HOW IS THAT POSSIBLE!??!?!
Zamasu is a kai and goku black is a saiyan (saiyan body) so the result is 1/2 Kai and 1/2 saiyan.
What happaned to them? Since Zeno was angry and decided to destroy everything they probably died too,agree? Maybe that is why Grand Priest has some evil plot in this arc,planning to overthrow Zeno.