I can confirm this since he did it on my planet while I was on it. As soon as it happened I got:
But was able to reconnect immediately.
Edit: To clarify after talking with @almund , the first screenshot he sent was what he gets on the creative world, vs the second is what you normally get on a normal planet.
It appear to be something with it trying to return a certain amount of the ingredients back to you when they were put in as an infinite source.
Deconstructing really isnt needed on Creative, but he used it out of habit from forging on Live.
Using deconstruction resin in the forge on a creative world disconnects the player / crashes the server =/
I guess it doesn’t like refunding forge items into stacks of forge items =P (though it looks like the game just treats them like a single item that never gets consumed based on how portal conduits treats oort shards)