Mine cart will NOT roll over a certain block. Freezes at that block.

I have discovered it is (several) invisible mine-carts on that block. This seems to be happening due to the recent "stuck on Leave Bed" screen that seems to be leaving the world with various corrupt states, like I now have a chunk that will not calculate lighting correctly after one of these Leave Bed freezes. The mine-cart(s) and sometimes detector rails would stick in the "on" state etc etc, after a bed crash.

My fix for the mine cart problem was to drop sand from above onto the block that had the invisible mine-cart. then save and quit the game. return and destroy the block. That brought the mine-cart back and destroy-able. It took several attempts of this process to eliminate all the mine-carts.  and fiddling with various arrangements of empty or solid blocks beside where the invisible carts were.

Definitely related to "Stuck in Bed" I have found places where villagers were standing when Stuck in bed happened.  Those blocks also will not accept a new block. If I drop sand to the area, save, return I hear them suffocating, and the block location becomes normal.