@GamerSeuss I'm not sure the asset disappeared so much as the location when you log in doesn't have to have a Z dimension in an isotropic game if you can't normally go under the bridge, so it drops you to the floor of the water, even though there's a higher Z.
My mind-reading guess would be that your coordinate from last log out is only X,Y.
That's what the behavior looks like, since the bridge is visibly there, and you can run to either end and get up onto it, and you have to wiggle to get out from under it.