Hello @apd - Our sincerest apologies on this one, there is a bug that exists in Revit 2023 that will be fixed in Revit 2023.1. Unfortunately we had issues with our build pipeline on the Revit 2023.0.2 hotfix so it didn’t make it in.
Please refer to Error - specTypeId is not a measurable spec identifier? - #17 by scott.tomlinson as a workaround should you choose to take it.