Ville Saari
Assigned
Reported
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I'm quite disappointed that 1.9 was released without fixing this bug. It has been a real showstopper for me and currently prevents me from upgrading my survival world to 1.9.
It is not just a cosmetic problem. Although the blocks are just client side ghost blocks, they are very real to the player, so the player can't pass through them. Hitting a ghost wall while flying with elytra will stop you, but does not cause the damage that hitting a server side wall would. However hitting a top side of a ghost block after a fall will damage or even kill you even when there was a safe place to land below it. Having your head inside a solid ghost block does not cause suffocation damage.
At least for me this is not a rare glitch. It happens consistently to every piston contraption that is moving while I'm not in immediate vicinity. If the contraption changed state in a way that should create an air block in a space that wasn't air before while I'm more than 64 blocks away but close enough for the contraption to be loaded, there will be a guaranteed ghost block awaiting me when I return.
I think I found a way to trigger this bug consistently in 1.9 pre 2:
Place a sticky piston, attach a block on it and set up a redstone clock to repeatedly extend and retract the piston. The period of the clock is irrelevant. Then walk away backwards while watching the piston. When you get far enough, the block gets duplicated. This happens exactly at the 64 block euclidean (spherical) distance.
When I'm outside that 64 block sphere, the block duplicates every time the piston retracts, but the duplicate block won't get pushed further when the piston extends again.
When I'm inside the sphere, the piston won't duplicate the block when it retracts, but when it extends, it will push the ghost block further if one exists on the way of the real block the piston is pushing.
So if I repeatedly step outside the sphere when the piston is extended and inside when it is retracted, I can make the contraption generate 12 block column of ghost blocks.
I observed this bug in 16w06a too. It can happen right under my eyes, no need to go x blocks away. When a sticky piston retracts, it pulls the real block back, but leaves a client side ghost block behind. When the piston extends again, this ghost can get get pushed further and pushes whatever is on its way too. But all this happens in client side only, so the mechanism doesn't really get messed up.
When this happens to a slime block contraption moved by a single piston, then every moving block that should leave empty block behind gets duplicated. It seems to never happen to just a subset of those blocks.
This happens on Linux too. The resolution setting worked fine a few days ago but stopped working when the launcher updated itself the last time.
Minecraft always opens in a tiny default resolution window no matter what I set in the launcher. If I set the resolution, then exit the installation editor and then open the editor again, my setting is still intact but if I launch, the Minecraft launches in default resolution and when I start the launcher the next time, the resolution I set has disappeared in the installation editor.
Also if I manually add the resolution to the launcher_profiles.json file, and then run the launcher, the resolution won't show in the editor and it also gets removed form the file.
The launcher says its version is Linux 5.4.0-132-generic 2.3.508
If I try use my window manager configuration to force Minecraft window to open in my preferred resolution, it will open in that resolution and then immediately resize itself to the tiny default resolution. So quickly that I can see the big window for only about one frame time.