Dropdowns are looking like working in subgraph. But when it comes to use in Shader Graphs, it starts making errors. And how it is possible an error at line 0? So I think it is bug about Shader Graph’s it self.
First photo have dropdown in subgraph. But in second one, subgraph has no dropdown. And first one is not working, but second one is working.
And also, is it bug or not, I don’t know but, every nodes’ input socekts are looking different then before. Sockets’ location and scales are looking different and strange.



