Integral difference when using variable or function

[danielbrown2]

With sympy 1.0, I seem to getting different results when doing an integral with respect to a function or a variable. Maybe I'm doing something wrong here but this:

import sympy as sy
from IPython.display import display

x,y,a,b,t = sy.var("x y a b t", real=True)
f = sy.var("f", cls=sy.Function)

I = sy.integrals.Integral(y*x/(1+sy.exp(-a*(x-b))), x)
display(I)
display(I.doit())

I = sy.integrals.Integral(y*f(t)/(1+sy.exp(-a*(f(t)-b))), f(t))
display(I)
display(I.doit())

Outputs this:

The solution of this type of integral should be:

I get that this type of integral isn't supported yet, but it seems wrong that the function variant returns an answer.