Background: I am using Anki Desktop Version 2.1.60 (76d88073) Python 3.9.15 Qt 6.4.2 PyQt 6.4.0 as well as AnkiDroid (automatic update). I keep track of my statistics manually as well as occasionally viewing within the desktop or Android apps. Before creating and account and posting here, I followed all the suggestions on the Anki website, ensured database checked for errors, started without any add-ons, etc. The problem persists on both platforms.
Problem: Sometime in the last week, Anki shows missing (zero data) for the following days on my account when I have manual records (rounded to the nearest minute, not # cards) showing study time: 20220102, 20220104, 20220107, 20220112, 20220114, 20220129, 20220204, 20220209, 20220222, 20221206, 20230120, 20230125, 20230221, 20230301 (YYYY-MM-DD format). I do not know if the issue was due to the recent daylight savings time change (as other forum members have noted). As my manual records do not include cards studied (only time), I cannot verify if there are other errors in numbers of cards studied on other days. Before trying to resolve the issue, I was running Windows version 2.1.54 but updating to 2.1.60 did not resolve the issue. Anyway, I first noticed the problem on AnkiDroid (main study platform) and then confirmed on Anki Desktop.
As I do not know the exact date the incident occurred, I do not want to start randomly restoring from automatic backups unless advised. Any insights are appreciated. Thanks in advance.