A variant of this bug is still occurring: between 4:00 a.m. (when Anki’s day resets) and 4:59 a.m., all reviews on the first day of Daylight Savings Time (this year March 12, 2023) are displayed as zero. After 5:00 a.m., they are again displayed correctly.
@kieran you dug into the previously-reported issue - if this piques your interest too, your help would be appreciated.