A tuplet whose notes land across a barsPerSystem system-wrap boundary is silently dropped entirely, with no warning

N/A — a Gradus implementation hazard, not a general engraving convention (a tuplet correctly straddling a LINE/SYSTEM break, as opposed to a bar, is normal in real engraving software and simply continues its bracket on the new system).

N/A (implementation defect) — contrast with Dorico/Finale, where a tuplet crossing a system break renders correctly with the bracket resuming on the new system.

This rule can be decided from pitches, durations and voices — no layout required. A validator can check it before anything is drawn.