Thank you for your reply. In your experiment, there is only data from certain days in 2021, so the problem cannot be seen. When you add some data from 2018 and 2019, you will find that the set start and end times are invalid. Please see my new post pictures, thank you!!
Originally posted by @zacharycode in https://github.com/pyrochlore/obsidian-tracker/issues/324#issuecomment-2014445996