Can see both zones, but control / temp is duplicated across both

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First of all, @andrewleech thank you so much for your amazing work on this! I have a bug and happy to provide any data and/or do any testing to help get it sorted out.

I have 2 zones, "Downstairs" and "Upstairs". Downstairs is the primary zone (ie Upstairs won't work without Downstairs being on). The integration loads the two zones correctly with the correct names, however the temperature always shows the Downstairs temperature. Similarly, if Upstairs is not on heat, but Downstairs is, it will say "Heat" for Upstairs as well. It's like all readings and controls only ever relate to the Downstairs zone.

Let me know what else I can provide (or try).

EDIT: as alluded to by @Rumbaar, I neglected to mention that I do have 2 zones, but I also have 2 physical controllers. One is downstairs, and one is upstairs. I'll let you work out which controller controls which zone ;)