Taking fall damage when planting crops

When sprinting across farmland and holding down the "place" button, you periodically take seemingly random damage. I have a 100% secure multilevel underground farm, and when it happened on one level, I checked below it and found a square had reverted back to regular dirt, and the crops were next to it as if I had fallen on it. I took a video clip.

https://youtu.be/JQM_FMjenL8