Issues with Thermostat settings in RM Legacy

I was under the impression we could stick with the legacy rule machine, just couldn't add new legacy rules. In my case, all I was trying to do was update a thermostat action.

Appreciate if the Thermostat device still functions for RM 4.0 -- I've got a lot of rules still in legacy, and many of them are inner dependent. All have been working fine until this issue popped up.

Thanks.