Increase to 29 bits for span limits, previously this was 13 and since the next field in the struct was a pointer, we end up using the 4 bytes padding so the struct size didn't increase. The reason for this increase is that rcSpan::smin and rcSpan::smax overflow when building a navmesh with a low cell height. This is especially an issue with maps that contain mountains. For the season 1 kings canyon map, the tiles containg the polygons for the firing range will be entirely flat due to the massive height difference between the base map and the firing range which resides under the map, causing it to be clamped to the previous MAX_HEIGHT value.
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