When walking through two stacked fence gates, if the top one is accidentally closed and the bottom one remains open, you clip through the block bellow the bottom one.

Closing the top gate or walking away from the block you clipped into fixes the issues. Unsure if this can be used to clip further into the ground than just one block. 

This issue was never present in previous versions of this world, if one fence gate was closed it would usually just propel me either into the enclosed area or outside, never clipping me down. 

If more details are needed please let me know!