Similar problems here. The some dataflows stopped refreshing successfully.
Dataflows on Premium Workspace.
Seems to affect dependent dataflows. Typical error message (entity varying with every refresh):
2023-01-23 18:07:53,10 NAV Common Basics,Failed,HinweisGruppiert,NA,Failed,2023-01-23 18:07:53,2023-01-23 18:08:12,00:00:18.6730,NA,NA,NA,NA,NA,NA,Error: Expression.Error: The field 'error' of the record wasn't found. Message = <ccon>An error has occurred.</ccon>. RootActivityId = 2cebf377-7a04-4b12-81e6-5c6eba581f75.Param1 = Expression.Error: The field 'error' of the record wasn't found. Message = <ccon>An error has occurred.</ccon> Request ID: ab6ebfea-5d5d-dac8-a230-4af03c542f6d.
Switching to pro and back didn't help.
Republishing the dataflows, even in a new workspace didn't help.
The problem started between thursday-friday night (jan 20th)..