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A dynamic array that couldn't spill was only rejected when results were written back, after formulas evaluated later in the same pass had read the array as if it had spilled. With 1s in A1:C3 except B2 = SEQUENCE(2,2,9) (blocked), =SUM(A1:C3) gave 47 after a full recalculation (opening a file, Calculate Now) instead of #SPILL!; a reader through OFFSET kept the wrong value even when entered one cell at a time. The spill area is now checked as soon as the array is computed, so the anchor is #SPILL! for everything after it.