Sorry I haven't got back to you on this. I tracked down the issue and a fix was just released for both the Hubitat app and plugin (v2.5.7).
Please keep in mind that while it works you will see a warning in the Homebridge Logs:
This plugin generated a warning from the characteristic 'Security System Target State': characteristic was supplied illegal value: number 4 exceeded maximum of 3. See https://git.io/JtMGR for more info.
Is this just since updating to 2.3.1? I’m pretty sure this was working on 2.3.0.
I’ll try to remember to test mine when I get home. Dummy me didn’t think about trying this during the beta.