Teams Workflows: Adaptive Card ColumnSet renders empty because columns are stripped from payload #430
Description
related to argoproj/argo-cd#26022
Problem / Issue
Using teams-workflows.adaptiveCard with an Adaptive Card that contains a ColumnSet, Microsoft Teams (via Power Automate) renders the ColumnSet as empty (its child columns/items are missing), while other non-ColumnSet elements render.
Expected Result
All child elements inside the ColumnSet (columns → Column.items such as TextBlock, etc.) should be rendered normally in Teams.
I think the code unmarshals adaptiveCard into limited structs (adaptiveCard / adaptiveCardElement) and marshals again, unknown fields like ColumnSet.columns / Column.items are dropped during unmarshal, so the outgoing payload lacks column content.