Deadlock situation with function expressions

The Reduce.jl, the following works
using Reduce
Reduce.expand(“3x+2y+2.12x+3.2y”)

However if I try the following
expand(“f(X,Y)+2g(X1,X2,X2)+2f(X,Y)”)
it gets into an infinite loop. If I interrupt once, and try again then it comes out with a prompt
“Type Y or N?;\n3f(x,y) + 2g(x1,x2,x2)”

and on the third time, it works well.
“3f(x,y) + 2g(x1,x2,x2)”
Looking into the code, it appears that there is an error check which prompts the Type Y or N? Is this an intended check? Can this be fixed?
This is a nice package that helps in quite a bit of symbolic expression simplifications. It would be nice to have this fixed. Or any other suggestions to work around it (instead of manually interrupting this 2 times).

Thanks for the help/suggestions

`using Reduce
expand("3x+2y+2.12x+3.2y")
expand("f(X,Y)+2g(X1,X2,X2)+2f(X,Y)")`

Reproduce the issue with the two expand expressions shown in the report, then inspect the error check that prompts “Type Y or N?”. Trace why the function-expression case loops and confirm the fix by verifying that the expression terminates and returns “3f(x,y) + 2g(x1,x2,x2)” without manual interruption.

Written by the indexing model from the issue text.