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There really is not more to it. Create a blueprint, game immediatly desynced for us every time.

We only tried one map though so not 100% sure if its map specific.

Same here - in multiplayer I made a deconstruction blueprint and the game instantly desynced in multiplayer once it was done. Friend tried to reconnect but it went into an endless desync loop. I think this is a new bug for this version since we were using blueprints in previous multiplayer versions without issues. Now constructing any blueprint in 0.11.13 with other players connected will cause an endless desync loop. Also loading a game with an existing saved blueprint is fine but the endless desync loop will happen as soon as another player tries to connect.

This seems to be an issue between Linux and Windows or 32 bit and 64 bit. Between a 64 bit Linux client and a 32 bit Windows client building a blueprint item or a deconstruction blueprint item will get you in a desync loop. Between two 32 bit Windows clients on the same map it seems to work.

Edit: Ok it works with one 64 bit Linux and one 64 bit Windows client. We could not test if it works with a 32 bit Windows client and 64 bit Windows client. So it seems to be 32 bit/64 bit issue.

Thanks for the report, it is fixed for 0.11.16.