Data not being set by x.Set() - Revit

[nilamo]

I think you'd have better luck asking the Dynamo/Revit community directly.

For anyone else who stumbles in here, Dynamo is: https://github.com/DynamoDS/Dynamo
And Revit looks like it's maybe the same thing, but built by AutoDesk: https://www.autodesk.com/products/revit/overview

And getting them to work together requires the Dynamo for Revit plugin: https://github.com/DynamoDS/DynamoRevit

UnwrapElement looks like it takes a Dynamo element, and returns the raw Revit element (which makes it faster and has more features or something, but then Dynamo stops tracking changes to it). The only way for Dynamo to know there's been changes to unwrapped elements is if there's a transaction (which it looks like OP is using).

I don't know what LookupParameter is/does, or what .Set() should do on whatever it returns, and how that process interacts with unwrapped elements.