Kessler Second Shooter Intervalometer + Sony Alpha A7x Issue

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When I plug in the intervalometer from the Second Shooter to a Sony Alpha A7x, the Sony camera ceases to allow changes to Shutter/Aperture/ISO until I physically unplug that cable and press the wheel button to snap it out of its trance. The intervalometer works, but I can't do anything else. 

 

At first I thought this was a Sony problem, but then I found that this doesn't happen when I plug in another remote/timer to the same port, which does the same thing. I can change the settings while the Vello Shutterboss does its thing, for example.

 

Does anyone here know enough to say what exactly the Second Shooter is doing on the INT -> Multi port that is locking Shutter/Aperture/ISO controls on the Sony A7x series? I've posted to the Kessler forum but haven't received a response. 

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Here's a video showing the issue: https://www.youtube.com/watch?v=azl49HWSANw