Doubling up of instances when building assemblies

[BradyAJohnston]

Currently there is doubling up of instances when building out assemblies. There should only be 60 chains in total for the whole assembly (60 instances) but instead there are 840.

This can be fixed in-nodes by inside of the generated assembly node, separating the instances and picking only those which match the chain_ids from the instances.

I haven't yet investigated, but I assume the assembly parsing code is doubling up on transforms that it is generating.