osu!mania scroll speed doesn't match the time given in settings in some custom skins

[MizuIro-H]

Type

Game behaviour

Bug description

Many mania skin's scroll speed is different from those "default" ones (slower in my case).
It seems like a issue from stable, and it will become kind of severe after lazer introduced "scroll time" for mania.
If it still exisets, it will make a huge misleading for mania players in lazer, especially those newbies who don't play/know stable.

You can get my skin Here to verify this issue in your device. It should be the same as the video in both Stable and Lazer.
I can't verify all mania skins (not to metion some of them use different skin styles in different key modes), so I only said some.
If there's a skin that perfectly allowed the scorll speed as official skin does, fell free to upload them. Comparing them maybe help devs solve this issue faster.

Screenshots or videos

It's way too large to upload in GitHub, so I uploaded to OneDrive. Please click the link Here to watch it.
TLDR: under both "speed 31" (lazer shows that scroll time should be 370ms), my custom skin's scroll time is about 450ms.(not exactly because I counted frames in camera. In-game recording can be easily affected by other performance issues so I recorded it outside)
osu! argon(2022), osu! triangles(2017), and osu! classic(2013) are showing the right scroll time w/o issues, even after you modified it and add something on HUD/playfields.

Version

2025.118.3-lazer (ALL versions of Stable and Lazer in recent years should perform same in this issue)

Logs

compressed-logs.zip

[peppy]

If it's just due to skin having different metrics, I don't think we can / will make this match. You'll just have to ballpark.

[MizuIro-H]

Then how about release a "metric"(sorry for my poor English I can't find a word to describe this) that follow the official skin in game, to let skinners can have a standard for it?
This should be useful in unifying scroll speeds in different skins.
I know it's impossible to force all mania skins have same scroll speed, but this speed discord may be less common to see in the future by giving a "official standard".