This is a very special case where online beatmap/ruleset models are
being ferried via `ScoreInfo` in what appear to `BeatmapDifficultyCache`
as local `BeatmapInfo`/`RulesetInfo` models. Here, BDC will incorrectly
attempt to proceed with calculating true difficulty where it cannot, and
return 0.
This is fixed locally because `ScoreInfo` is a very weird model, and I'm
not sure whether BDC should contain logic to work around this.
This class was only used in two places, both on the results screen, but
was holding references to `OsuPlayfield` game-wide (due to unrelated
issues, but still).
Because I can't really think of future use cases for this, and running
the calculation twice at results screen isn't a huge overhead, let's
just do that for now to keep things simple.
This isn't perfect and probably needs much more consideration, but let's
at least give the "better" ranks more visibility by bringing them to the
front.
Of note, this is only important due to the changes to osu!catch
accuracy-grade cutoffs, which brings things closer in proximity than
ever before.