Ground Heat Exchanger Simulation Issue in OpenStudio Model Version Discrepancy

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On the SDK side of things, the undisturbed ground temperature model options for ground-source heat exchanger classes have evolved since v3.4. CTRL-F "undisturbed" in both horizontal and vertical SDK classes. Forward translation issues were fixed for SDK v3.6 for horizontal, and subsequently harmonized for SDK v3.7 for vertical. These SDK issues were first filed following a related OpenStudioApplication bug report. Although the SDK fixes are now completed, the App issue remains open.

Up until v1.6, App users indeed had 2 options ("KusudaAchenbach" and "SiteGroundTemperature") for the horizontal model, with related parameters:

I think this is what you're referring to. As of v3.6, the SDK no longer supports both options:

... which is likely why you're not seeing these options in App v1.6 onwards. I suspect these were deprecated when merging in the aforementioned fixes. Given the reliability of the SDK fixes, I'm linking this post to the initial App bug report - a friendly reminder to move forward with a fix.