While the game is playing on a world when blocks need to update they don't seem to. When breaking Reeds on the bottom block the 2nd and 3rd don't disappear but the items drop, forcing me to break the empty blocks manually to remove them. This also happens when torches are on a block that is broken, the torch drops but the entity in the world stays.
The biggest issues are when trees grow it acts like it is now a tree but doesn't load, the bottom log is there but the rest of the tree is missing and lava and water don't flow if they are placed while when the source is cut off the flowing blocks don't despawn.
The only way I have found to sort of solve the issue is save and exit then reload the world, but this is cumbersome and only fixes what should have loaded and I will have to repeat the save and exit if I want anything else to update.
I can place blocks into the world and they work correctly, and I also can remove blocks and they work correctly it only seems to be when objects are updating more than one block or an entity.