I just walked into where I am storing some of my stuff, only to find most of the chests that were double chests are now single chests, when opening them only the top half of the inventories are are still there. Particularly bothered because my diamonds were in the bottom half of one of the chests. Having done a quick search for the issue I can say that the chests are not on the border of the chunk. The world was made recently after the full release of 1.14, I have had a couple of other issues not sure if related, I had a diamond pick disapear from my inventory, it had a couple of enchantments and was early into my play through. I also have noticed getting lag when trying to open chests and sometimes they just don't open.

Screenshot is of the area affected by the missing chests. I did try placing a new chest in the location of one of the missing ones but the inventory did not come back.