Here's the Nu's riddle. I put Kajar, kajar and KAJAR as possible answers.
For location {17C}, the only difference between the 2 spots you mentioned is that one has Sprite Over L1/L2 "False" and the other has "True" (in the tile props window, not the left menu stuff). If you put True to all the walkable tiles (including the "rounded corners", but probably not the tiles which are under the tree) then Crono will be above everything.
Also, since most tiles in the tile swatch are present twice (one with priority and one without), an alternate solution is to use only the tiles with no property when you make the map.
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