The refresh history file from a dataflow assumes the first column is in American date format but dates are recorded in local format so in the CSV file the first column Run time contains "Invalid Date". The Start time and End time work fine.
I have reported this issue internally, ICM:215387663. will update here once I get any information.
I will close this thread as the issue is resolved now.
We’ve identified the issue and it will be fixed in January.