Bug/Issue Robin working on silo causes chest to disappear

I had Robin build a silo on the left side of the wilderness farm, near Grandpa's shrine. During the first day that she was building the silo and I happened to be on the left side of my house, she suddenly zoomed towards me (a lot faster than the normal walking speed) and caused one of my chests to disappear along with the content (lots of different fish!).

The attached file shows the location of the new silo, and the arrow shows Robin's path of movement.

Could you advise or help me retrieve my stuff? Thanks~