Reviewing a single card in session decreases review cards due in session by more than 1

Hi!

I'm running Anki Version ⁨2.1.54 (b6a7760c)⁩ on macOS 13.0.1 (22A400) on an M1 mac. I've run into an issue that I can't find documented elsewhere.

When I'm already in a review session (e.g., the screenshot below), reviewing a single card sometimes causes the number of review cards due (the green 38 in the example below) to drop by multiple cards (sometimes >10 cards). So I'll be studying cards, and marking most cards as "good" just moves the counter down by 1. However, occasionally, marking a card as "good" drops the counter by more than one card.

I suspect that these cards might be getting buried, but per the documentation (https://faqs.ankiweb.net/the-2021-scheduler.html), I thought that the burying process happened after you launched a review session (i.e., the counts displayed at the beginning of the session already accounted for burying)? I'm running the v2 scheduler, I believe. However, I'm switching to v3 to see if this changes things.

Interestingly, the "Progress Bar original" add on is always aligned with the number of cards I'll actually be required to review in a session. I.e., if the counter initially shows 40, but 10 cards will suddenly disappear from the counter, that add on would be showing my progress based on the 30 cards I would actually be required to review, not the 40 initially shown in the counter.

If this is a documented phenomenon, I apologize for not understanding that. It just seemed bizarre to me that the counter would drop by so many cards after a single card review when the notes in question only had 1-3 cards, not 10 (so burying more than 1-2 cards wouldn't make sense to me for these notes).

Thank you!

Debugging Information Anki 2.1.54 (b6a7760c) Python 3.9.7 Qt 6.3.1 PyQt 6.3.1 Platform: Mac 13.0.1 Flags: frz=True ao=True sv=2 Add-ons, last update check: 2022-12-08 12:41:22

===Add-ons (active)===
(add-on provided name [Add-on folder, installed at, version, is config changed])
Answer Confirmation for 21 ['1354051622', 2019-04-04T08:54, 'None', '']
Button Colours Good Again ['2494384865', 2022-09-27T06:18, 'None', '']
Copy notes ['1566928056', 2021-12-24T14:56, 'None', '']
Customize Keyboard Shortcuts ['24411424', 2022-09-14T05:12, 'None', '']
Image Occlusion Enhanced for Anki 21 ['1374772155', 2022-04-09T03:15, 'None', '']
More Overview Stats 21 ['738807903', 2021-07-30T15:13, 'None', '']
More Overview Stats ['2116130837', 2022-09-16T13:56, 'None', '']
Progress Bar original ['1685464019', 2022-07-28T01:24, 'None', '']
Review Heatmap ['1771074083', 2022-06-29T21:43, 'None', '']

===IDs of active AnkiWeb add-ons===
1354051622 1374772155 1566928056 1685464019 1771074083 2116130837 24411424 2494384865 738807903

===Add-ons (inactive)===
(add-on provided name [Add-on folder, installed at, version, is config changed])
Advanced Browser ['874215009', 2022-09-26T20:28, 'None', '']
Answer Shortcut Keys ['687138446', 2018-01-26T17:18, 'None', '']
Colorful Tags  Hierarchical Tags ['594329229', 2022-09-15T11:06, 'None', '']
Deadline2 ['723639202', 2021-05-02T00:45, 'None', mod]
Extended Card Stats During Review ['1008566916', 2017-08-29T14:59, 'None', '']
Frozen Fields ['516643804', 2020-02-29T23:12, 'None', '']
Life Drain ['715575551', 2022-09-18T06:42, 'None', '']
Multi-column note editor ['3491767031', 2021-11-02T11:18, 'None', '']
Pop-up Dictionary beta ['153625306', 2019-03-23T13:32, 'None', '']
Session Timer ['1287298831', 2020-06-30T12:35, 'None', '']
Speed Focus Mode auto-alert auto-reveal auto-fail ['1046608507', 2019-06-02T05:11, 'None', '']
Web Browser - Search terms Import texts and images automatically ['864545277', 2022-08-02T16:49, 'None', '']
Zoom 21 ['1846592880', 2020-01-12T12:26, 'None', mod]
load balancer ['1417170896', 2020-08-05T19:58, 'None', '']

ankitects / anki

Reviewing a single card in session decreases review cards due in session by more than 1 #2249