Incorrect output from broadcast expression with conversion

Reproducer:

```julia
using ClimaCore.CommonSpaces
using ClimaCore: Geometry, Fields
FT = Float64
space = ColumnSpace(FT;
z_elem = 10,
z_min = 0,
z_max = 10,
staggering = CellCenter()
)
const CTh = Geometry.Contravariant12Vector
ᶜuₕ = Fields.Field(Geometry.Covariant12Vector{FT}, space)
∂ᶜK_∂ᶜuₕ = Fields.Field(Geometry.Contravariant12Vector{FT}, space)
@. ∂ᶜK_∂ᶜuₕ = CTh(ᶜuₕ)
```

This is a reproducer that @dennisYatunin and I conjured up, which needs fixed for supporting FiniteDifferenceSpace simulations in ClimaAtmos.

cc @imreddyTeja