inputs lost when composing systems? #3943
Description
Describe the bug 🐞
On 10.23 it seems like composing two systems causes the inputs to be lost. I'm not sure whether this is actually a bug or intended, but I'd expect the input to be carried over to the larger system
Minimal Reproducible Example 👇
@variables x(t) y(t) [input=true]
@named sys = System([D(x) ~ y * x], t)
inputs(sys) # y(t)
csys = compose(System(Equation[], t; name = :outer), sys)
inputs(csys) # Symbolics.BasicSymbolic{Real}[]