natural=grassland is typically used for wild growing grass. Since the city maintains the park it's unlikely that it is wild grass. landuse=grass is what we use to described grass covered areas. I know it's confusing. See https://wiki.openstreetmap.org/wiki/Tag:natural%3Dgrassland for more info. Can you review this changeset and fix the area as needed? I'll send you more info on OSM in a message.
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            Published using OSMCha: https://osmcha.org/changesets/147349329
            