Q. If I place a house on Test Center, will my house on a production server enter into decay? A warning message pops up on Test Center that my house on any other shard will decay.
A. If you place a house on Test Center, your house on your main shard and/or Siege will be fine. The message pops up because it is a test shard – a copy of another shard and it insures that things are continuing to work as intended, but will not cause your house(s) to decay on production.
Q. If I place a house on Siege, will my house on a normal production server enter into decay? A warning message pops up on Siege that my house on this shard and on any other shard will decay.
A. No. With publish 82? they enabled the ability for players to have a home on Siege or Mugen and not decay your other homes on other shards. So now you can have a home on Siege and your home shard/visiting shard.