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When a node type name is renamed, you will no longer see a contemplate template for it, even though it is still stored in database. It would be great if the template was renamed alongisde node, although this is perhaps more bug to submit for node module.
In any case, it would be great if this was documented somewhere, so people won't get scared.
I have almost freaked out completely when this happened to me with a node type, on design which I was working for hours. Thought I lost the template ;-)