Contraption spawners become offset when duped

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What steps will reproduce the problem?
1. Create a contraption spawner with multiple entities
2. Weld/parent it  to another entity
3. Duplicate the entire thing
4. Spawn it

What is the expected output? What do you see instead?
Expected: The contraption spawners ghost and entities stay in the same place 
they were in before the duplication

Instead: The base entity of the contraption spawner is in the correct place but 
its ghost is offset, this offset carries over into the contraption on spawn

What revision of Advanced Duplicator 2 are you using?(Don't put latest
version, put the revision
number)
Unknow, sorry.

What Operating System is the server running?
Unknown

Please provide any additional information below.

Original issue reported on code.google.com by CRYS1S...@gmail.com on 26 Jul 2014 at 6:00

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On a side note it would be really nice to be able to spawn a contraption 
spawner without its ghost.

Original comment by CRYS1S...@gmail.com on 26 Jul 2014 at 6:04

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I think this should have a higher priority. Because as of now, this behaviour 
makes it essentially impossible to use composite prop spawners in contraptions, 
since you can't save them for later use.
I'll explain, due to the fact that copied spawners become offset, the props 
spawned often fly away with great speed upon appearing. This makes the spawner 
unusable. 

To add more info to bug report, the Operating System for me is Windows 7 x64 in 
both cases, and the revision is... well I took AdvDupe2 from GitHub yesterday, 
the problem persists.

Original comment by seedm...@gmail.com on 23 Feb 2015 at 10:14