Rpg Maker Developers Group

I feel like iv been trying to get this to work for way too long.  All I want is to be able to push a boulder into a body of water and then be able to use the boulder as a bridge.  Iv seen a ton of forum posts about this same issue and from what I can tell if you set an event to below characters and have 'though' set to on it should make the area passable. I have the previous event page set to when the boulder gets to a certain coordinate the next move it will make when pushing it puts it into the water and turns on the self switch.  The self switch should just make it so the boulder is beneath the character and is passable therfore making it a bridge.  However I cannot even move onto the boulder.  I want to set up a series of small puzzles like this in my forest dungeon and eventually throughout the rest of my game.  What am I doing wrong!?  Using RPG maker MV.

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