fix: fix initialization using u0map::Dict

Author: AayushSabharwal

src/systems/diffeqs/abstractodesystem.jl

@@ -877,7 +877,11 @@ function process_DEProblem(constructor, sys::AbstractODESystem, u0map, parammap;
         initializeprobmap = getu(initializeprob, unknowns(sys))
 
         zerovars = setdiff(unknowns(sys), keys(defaults(sys))) .=> 0.0
-        trueinit = identity.([zerovars; u0map])
+        if u0map isa Dict
+            trueinit = identity.([zerovars; collect(pairs(u0map))])
+        else
+            trueinit = identity.([zerovars; u0map])
+        end
         u0map isa StaticArraysCore.StaticArray &&
             (trueinit = SVector{length(trueinit)}(trueinit))
     else
@@ -915,7 +919,6 @@ function process_DEProblem(constructor, sys::AbstractODESystem, u0map, parammap;
         du0 = nothing
         ddvs = nothing
     end
-
     check_eqs_u0(eqs, dvs, u0; kwargs...)
 
     f = constructor(sys, dvs, ps, u0; ddvs = ddvs, tgrad = tgrad, jac = jac,