refactor: don't do CSE hack for operators

Prevents annoying equations with `Initial` parameters

Author: AayushSabharwal

src/structural_transformation/symbolics_tearing.jl

@@ -647,6 +647,7 @@ function cse_and_array_hacks(sys, obs, subeqs, unknowns, neweqs; cse = true, arr
         # HACK 1
         if cse && is_getindexed_array(rhs)
             rhs_arr = arguments(rhs)[1]
+            iscall(rhs_arr) && operation(rhs_arr) isa Symbolics.Operator && continue
             if !haskey(rhs_to_tempvar, rhs_arr)
                 tempvar = gensym(Symbol(lhs))
                 N = length(rhs_arr)