Try using allow_mismatched_diagonalized_spaces to make swap_spaces no…

…t allocating

src/Utilities.jl

@@ -6,7 +6,8 @@ modules in the coupler.
 """
 module Utilities
 
-using ClimaCore: Fields, Spaces
+using ClimaCore: Spaces
+import ClimaCore.Fields
 
 export CoupledSimulation, float_type, swap_space!
 
@@ -70,8 +71,10 @@ Remap the values of a field onto a new space.
 - `new_space`: [Spaces.Space] to remap `field` to.
 """
 function swap_space!(field::Fields.Field, new_space)
+    Fields.allow_mismatched_diagonalized_spaces() = true
     field_out = zeros(new_space)
-    parent(field_out) .= parent(field)
+    field_out .= field
+    Fields.allow_mismatched_diagonalized_spaces() = false
     return field_out
 end