mwg API
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    Variable RPGM_AUTOTILE_SLOT_COUNTSConst

    RPGM_AUTOTILE_SLOT_COUNTS: readonly [768, 1536, 1536, 2304] = ...

    How many MV tile ids each family holds: 16, 32, 32 and 48 kinds of 48 shapes each. A sheet holding fewer cells than its slot needs is a truncated custom sheet, not a different layout.