Random mod - broken difficulty calculation

[altrevamp]

Type

Game behaviour

Bug description

Certain maps, usually around 5* range, gain a very high difficulty increase when selecting the Random mod. Sometimes it can jump up to 7-8* like in the first video provided.
For some reason, other mods that usually don't change the difficulty rating (hidden, traceable, autoplay) can increase or decrease the difficulty as well, also shown in the first video.

The actual difficulty of the map with Random is clearly not 8* (shown in second video).

Screenshots or videos

2024-09-06.15-27-12.mp4

2024-09-06.15-27-44.mp4

Version

2024.906.1

Logs

compressed-logs.zip

[cihe13375]

For some reason, other mods that usually don't change the difficulty rating (hidden, traceable, autoplay) can increase or decrease the difficulty as well, also shown in the first video.

This is not a new behavior, I think it happens because the seed is recalculated when selecting a mod (if you manually specify a seed the SR would not change with e.g. HD anymore)

The high SR itself is likely a bug though, or at least the last release does not behave like this

[Joehuu]

For some reason, other mods that usually don't change the difficulty rating (hidden, traceable, autoplay) can increase or decrease the difficulty as well, also shown in the first video.

That is a duplicate of #13453.

Leaving this open for the other issue.

[altrevamp]

I found that applying the Strict Tracking mod as well seems to correct the difficulty.

Edit: This led me to finding out that fast reverse sliders (and buzz sliders) cause a massive increase in pp. This might be causing the issue. First video shows a more extreme example of this, and the second video shows two reverse sliders adding 200+ pp.

2024-09-07.01-21-21.mp4

2024-09-07.01-26-43.mp4

[hachuyenden]

Yeah I just played the random mod like you a few minutes ago and the star difficulty and pp reward increased which shocked me even though I knew it was a bug. That beatmap was only a 3 star map. Will probably just temporarily consider random a bug for a while.