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christmastide's Sunday was coded privileged-sunday (Advent's own tier), which live-checking against the reference engine shows is wrong: on every one of the three real collision dates (St. Stephen/John/Holy Innocents, all Duplex-II-classis, falling on the Sunday within the Octave) the saint wins outright and the Sunday is merely commemorated -- the reverse of what privileged-sunday would produce (Sunday stays primary, saint just gets a nod). St. Silvester (plain Duplex, Dec 31) confirms the same live. Reclassified to ordinary-sunday, which matches all four checked cases: Duplex+ wins outright (Stephen/John/Innocents/ Silvester), Semiduplex still transfers off the Sunday rather than winning (St. Thomas Becket, unaffected by the fix either way), and a day with no saint at all resolves to the Sunday cleanly. Found while pulling christmas-octave-sunday's own Benedictus antiphon from the reference engine's dedicated Tempora/Nat1-0 proper and noticing this app's own occurrence resolution didn't match what the live engine showed for the Sunday's real collision dates. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>