This issue is NOT RESOLVED. I have it consistently, at least once a play session on a Bedrock Realm running and created in 1.20.6. I will add, which I haven't seen mentioned by others, that you can fix the issue by dropper picking the glitched stack to your hotbar if it's not already on there rather than relogging.
I will add that I believe every time the stack size has only been incorrect by one or two items each time, and twice out the hundred or so times it's happened, it was a shulker box that I wasn't picking up with any other items.
This bug still affects current PC version, 1.20.73, I believe, though I'm not sure where to locate the world version information in Bedrock Realms. I have noticed the bug as most people have, while shift clicking into an inventory from the player inventory, however, I have also experienced it twice with a shulker box that I'm fairly certain was the only item I was picking up at the time, which seems to contradict several theories that others have put forward. Those shulkers occupied an inventory slot invisibly. I will add that I can fix the issue without relogging if I can dropper pick the slot contents to my hotbar from my inventory, and when they move, they update to the correct number of items. I was able to fix one of the shulkers this way, but only because it was empty, and thus dropper pickable.
This issue is NOT RESOLVED. I have it consistently, at least once a play session on a Bedrock Realm running and created in 1.20.6. I will add, which I haven't seen mentioned by others, that you can fix the issue by dropper picking the glitched stack to your hotbar if it's not already on there rather than relogging.
I will add that I believe every time the stack size has only been incorrect by one or two items each time, and twice out the hundred or so times it's happened, it was a shulker box that I wasn't picking up with any other items.
This bug still affects current PC version, 1.20.73, I believe, though I'm not sure where to locate the world version information in Bedrock Realms. I have noticed the bug as most people have, while shift clicking into an inventory from the player inventory, however, I have also experienced it twice with a shulker box that I'm fairly certain was the only item I was picking up at the time, which seems to contradict several theories that others have put forward. Those shulkers occupied an inventory slot invisibly. I will add that I can fix the issue without relogging if I can dropper pick the slot contents to my hotbar from my inventory, and when they move, they update to the correct number of items. I was able to fix one of the shulkers this way, but only because it was empty, and thus dropper pickable.