Speculation on BPM Change Implementation

In this game, BPM changes are not implemented by modifying the BPM at specific measures or beats, but rather by restarting the score at specific time points.

As a result, when a BPM change occurs immediately after the start of a measure, the editor may display overlapping double bar lines. (→ See this image)

This behavior is also used to synchronize the start position of the track with the beginning of a measure.

Therefore, in this score database, double bar lines shown in the editor are not published as-is, but are instead merged into a single bar line.