Amazon Forecast console ignores frequency specification of hourly during dataset import, and actually assigns daily

Amazon Forecast console ignores my data frequency specification of hourly during target time series dataset creation / import, and actually assigns it a daily frequency. The actual CSV file imported is also hourly. This is in Lab 1 of the Amazon Forecast Workshop, at https://catalog.us-east-1.prod.workshops.aws/workshops/b28f3502-ca9f-4e12-8b84-59e454c1ed53/en-US/040-lab1/createfirstforecast . I do exactly as mentioned there in the screenshots, importing at a hourly specification. However, after the import job is complete, when I view the target time series parameter selections information by clicking on 'View' in the Amazon Forecast dashboard to the right of 'Target time series data', it shows daily. Anyone else has a similar problem, and how do I resolve this?