Here is a link to a HS110 Teardown.
I think @Ipearce point was that the HS110 it intended to be used on a system with only one hot wire, one neutral and one ground. In the US this is only for 120 VAC as 240 VAC has 2 hot wires using our split phase system. It may work but it will not meet US electrical code, in my opinion.
To confirm, the HS110 relay, the Omron G5RL-1A-E-HR is a single pole relay with high inrush and a 16 A at 250 VAC rating so is will handle the current.
When you cycle power to your HS110, that is connected across the 240 VAC split phase, your charger will still have power on one of the hot wires in relationship to neutral. Your charger may not be charging but it will definitely have one side of the split phase still hot inside your charger. This is causing the charger to to see a non-normal state and it could still be powering up control circuits, etc. Since this current would be on the non-monitored side of the HS110, I assume it would just show up in “Other”.
I think this a very cool workaround for your issue with detecting two Volts but it’s not “safe” by government standards, IMHO. It might even void the warranty of your EVSE?? Did you wire a 120 VAC duplex outlet to your 240VAC feed to plug in the HS110 and then put a 120 VAC plug on your EVSE so you did not have to hack the HS110? That’s what I might do. Hacking the HS110 and putting 240 VAC plug on it would allow you to keep your house to code?? hummm I would not let my county electrical inspector see this and please consider removing the plug if you move. If you did the HS110 install differently for your 240 VAC installation, I’d be interested in hearing about your setup.