Update src/tensors/abstractblocktensor/conversion.jl

Co-authored-by: Lukas Devos <ldevos98@gmail.com>

Author: kshyatt

src/tensors/abstractblocktensor/conversion.jl

@@ -28,7 +28,7 @@ function Base.convert(::Type{TensorMap}, t::AbstractBlockTensorMap)
     N₁, N₂ = numout(t), numin(t)
     cod = ProductSpace{S, N₁}(oplus.(codomain(t).spaces))
     dom = ProductSpace{S, N₂}(oplus.(domain(t).spaces))
-    tdst = similar(t, cod ← dom)
+    tdst = TensorMapWithStorageType{scalartype(t), storagetype(t)}(undef, cod, dom)
 
     issparse(t) && zerovector!(tdst)
     _copy_subblocks!(tdst, t)