I can confirm other block entities, every type of container and light sources get stuck as well. Entities freeze, become invisible and do not react to anything, simply glitching out players who walk where they used to be. In multiplayer, it is quite hard to reload the affected chunks...
I believe this is a (block-) entity related bug. Upon chunk loading, several blocks such as furnaces or containers stop working, light sources are all "de-actvited", and entities disappear and glitch. Hope this will get fixed asap !
There is an issue with every type of entity upon world reload. They appear to "freeze" and disappear, and react to nothing except the /kill command. Block entities like hoppers are also affected : furnaces stop working, and you can not open any type of container if you are in anything but spectator mode.
This seems to happen almost exclusively in the very chunk in which the player is upon world reload (or player reconnection in multiplayer). I'm currently looking for similar issues on here to see if any improvements are to be made.
Actually yes, this is the same bug. What doesn't work with hoppers are the block entities. They seem to get frozen upon reloading the chunk they are in. In the case of hoppers, it means the hopper is still physically here, but its inventory is frozen and it can not interact with anything.