Stone Timer Desync

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Specifications

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• Versions: 1.00a
• Difficulty: Easy - Normal - Hard - Lunatic - Extra
• Mode: Main game - Practice mode - Spell practice
• Shottype: Reimu - Marisa

What happens

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A seemingly abrupt desync could appear in the replay. If a side by side comparison would be made (one desyncing and the other not desyncing) it would appear that the desynced replay can summon a stone one frame off than intended. This desync only takes place during a boss or mid-boss. This bug only affects stages after Stage 1: Stages 2 through 6. In other words, only main game credits are counted: stage practice, spell practice, and Extra are not affected.

How it happens

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There is only one way in which this desync can happen, which is by starting a replay directly from a stage between Stages 2 through 6. This desync is not guaranteed to happen but common enough to usually encounter it at least once in a clear.

Why it happens

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During a boss or mid-boss, your stone gauge automatically increases by 2 every 3 frames. More specifically, the stone gauge increments by 1 if timer % 3 < 2 where timer is a timer that increments by 1 for every frame a boss or mid-boss is alive for. (For the technical readers, the value of timer is found at *(int*)(*(int*)(th20.exe + 0x1c6118) + 0x28 + 0x4).
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However, timer is never saved in the replay. This means that any replays starting from stages 2 through 6 have a 66.7% chance of having a wrong timer value, resulting in an imbalance in your stone gauge. The imbalance in your stone gauge enables the replay to desync, though it does not mean a desync is guaranteed from it.

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Links

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Replays

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Videos

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