The TimePicker widget allows specifying a max date via its options. If none is specified, the widget uses a default max date (00:00 of the current day). However, since the selected value also use the current day for its date part, all selected values are bigger than the max value.
This means that when checking whether a selected value is smaller than the defined max value, the check will always fail, because e.g. 2022-12-22 12:00 is bigger than 2022-12-22 00:00. This DOJO demonstrates the behaviour (select a value and check the console output).
In my opinion, it would make more sense to set the default max date to either 23:59 or 00:00 of the following day.