Player falls through certain non-full blocks when loading world

What I expected to happen was...:

I should log back on where I logged off.

What actually happened was...:

Standing on any of several blocks with non-full collision boxes when you log off results in falling through the block when you log back in. (Marked with  below.)

Steps to Reproduce:

1. Build a test setup like the one picture below
2. Stand on the affected block and exit the map
3. Load back into the map and note you are now cooking

Notes

• Sometimes without a barrier as displayed you can get displaced to a surrounding block. However this isn't guaranteed.
• When logging out on a stack of 2 double chests you will sink to be standing on the lower double chest and unable to move.

Block lower when logging in, sink in chest, fall through chest