cda9440a29 inadvertently fixes this in the
most frequent case by inverting the `TickDistanceMultiplier` from being
not-1 to 1 on beatmap versions above v8.
This can still potentially go wrong if a beatmap from a version below v8
is edited, because upon save it will be reencoded at the latest version,
meaning that the multiplier will change from not-1 to 1 - but this can
be handled separately.
Test is an abridged / cropped version of
https://osu.ppy.sh/beatmapsets/971028#fruits/2062131 to demonstrate
the specific failure case (unfortunately can't use the whole beatmap
due to other conversion failures).