Smart Narrative / Dynamic Value Failed to Load

Hi,

Text boxes with dynamic values used to show up normally in Service. But from this week, it failed across all workspaces and pipeline environments.

To make sure this issue is not specific to my model, I created a simple test model with a single calendar table from Dataflow and a single measure. The measure is used in a card visual and a text box as a dynamic value. It works fine in Desktop. But after publishing it to Service, the text box shows an error message.

Does anyone know the possible cause?