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Late hits on short sliders can cause incorrect combo breaks #25651
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I'm putting this on the project because it keeps coming up and looks generally important. That said I don't know how we fix it. Reverting the commit mentioned in the OP helps, but that was supposed to fix scoring in the first place, which is broken by this because depending on judgement ordering it may cause 1M score to no longer be achievable anymore (see #24966 (comment), #25200). We could paper that over by going "let's just do exactly what stable did" and having slider parts not give combo bonus but I dunno. @ppy/team-client any brilliant ideas welcome. |
@smoogipoo tentatively assigning this one to you. not sure this needs to be in the project if it only affects legacy replay playback, but definitely worth looking into to see what exactly is going on stable's end, and you are the deepest in slider knowledge right now. |
This issue would also be resolved by the recent changes in #25776 |
For reference, can you explain how that PR fixes a stable compatibility issue? |
The miss here is a case we've discussed recently - a key is being held from a previous object while cursor enters the next slider. The next slider is a buzz slider, so the repeat gets judged before the head is pressed with the key the player intends to use for this slider. This condition kicks in, which forces a miss on the head: osu/osu.Game.Rulesets.Osu/Objects/Drawables/DrawableSliderRepeat.cs Lines 97 to 98 in deef7da
The PR above doesn't allow the repeat to get judged until the head is judged. Stable allows out-of-order judgements. |
Type
Game behaviour
Bug description
This issue can happen with buzz sliders or with slider streams, the latter being much more apparent.
In this replay, there is a sliderbreak at 1348 combo on a buzz slider which was clicked after the first repeat. In this other replay, there is a sliderstream at 1826 combo where most of the sliders broke combo, despite being an FC in stable.
This issue is caused by 5503407.
Screenshots or videos
2023-12-02.18-24-02.mp4
2023-12-06.20-12-55.mp4
Version
2023.1130.0-lazer
Logs
database.log
input.log
legacy-ipc.log
network.log
performance.log
runtime.log
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