I just had this happen to me as well in a single player world in survival mode. I cut down a series of trees in a row, heard the block break plop sound... but no logs on ground or inventory.
save and exit game is now still locked up 15 minutes+ after initiating the exit.
Side note, item pickup has been seen delayed as well (when trees dropped logs still).
Edit: version 19w05a , log file does not contain recent information, last entry was from ~5 minutes before I logged out when I toggled the hitboxes on (F3+B)
I just had this happen in my SP world. I've uploaded the crash log.
Killed a lead pillager and started a raid. As soon as the raid bar filled up the game crashed.
This was replicated in my single player in 18w50a world. I died from a skeleton early game and when retrieving my items died again from an invisible creeper. I then was playing with F3 + B for hit boxes. The jerk skeleton that initially killed me was now invisible and firing arrows at me, no hit boxes seen until the arrow was loosed upon me (arrow has hitbox). logged out and back in to resolve.
I uploaded (then removed and uploaded again for quality) short video clips depicting the issue as well as the screenshot.
The only notable difference that I saw, apart from the broken functionality of the hopper, was that the items are consolidating world entities into one per type of stackable item I threw.
attached server side crash log after blowing up my son with TnT in 17w50a
crash-2017-12-23_08.25.51-server.txt
Trying to grind membrane on Realms and having the same issue. Seems like they will attack sometimes when I am paying attention to killing other mobs.