Steps to reproduce
Make a world with cheats enabled
Open to LAN (Cheats disabled)
Try using commands or using command blocks
→ Commands work, but command blocks have no placing animation and no breaking particles and you cannot interact with them (similar to MC-87872 and MC-87877)
Code analysis
The following is based on a custom decompiled version of Minecraft 1.10.2 using MCP 9.31.
This happens because the client thinks the player is unable to use commands and destroy command blocks whereas the server thinks the player is able to use commands and break command blocks because he is the owner.
Client method:
net.minecraft.client.entity.EntityPlayerSP.canCommandSenderUseCommand(int, String)Server method:
net.minecraft.server.management.PlayerList.canSendCommands(GameProfile)
Related issues
is duplicated by
MC-89128
Open to Lan Breaks Command Block GUI and more
MC-89239
Cannot interact with Command Blocks in published single player
MC-90621
Command blocks sometimes don't load their GUI for LAN guests, even after long periods of time
MC-92467
Lan worlds giver either everyone admin permission, or gives no one permission.
MC-96281
Command block, Open to Lan.
MC-99407
Command Block Bug - LAN Multiplayer Issue - Command Blocks Are Not Editable - Sometimes Leads to Frozen Game On Quit
MC-102716
Could not use command blocks when a LAN server was open.
MC-103393
Command Blocks LAN w/o Cheats when having Cheats for yourself
MC-105904
open to lan command block glitch
MC-111195
Command block
MC-113112
Can't use Command_Block
MC-113390
I can't use command blocks.
MC-116361
You can't interact with command blocks in multyplayer
MC-121624
No break particles or place animation for command blocks on LAN
MC-121625
Command block interface cannot be opened on LAN
relates to
Comments
migrated
[Mod] Neko
They are off but the player hosting can still run commands. Also theres no breaking animation.
kumasasa
[Mod] Neko
Yes 37a.
migrated
Can Confirm this is still a bug.
Had a LAN world for the past few weeks in the latest 1.8, swapped to Pre-3 and I am unable to use or edit command blocks.
migrated
A way you can work around this bug is to right-click a command block before you open the world to LAN. Then, you can edit the command block after you open it to LAN.
migrated
This is confirmed for 1.12.2
migrated
Ok I found and fixed the issue for my mod in 1.12:
In the IntegratedServer.shareToLan() you need to change:
mc.player.setPermissionLevel(allowCheats ? 4 : 0);
to:
mc.player.setPermissionLevel(allowCheats ? 4 : mc.player.getPermissionLevel());
yeah that's basically it that's all you have to do to fix said issue. It's already fixed in my 1.12.2 mod just need that little edit for 1.13
[Mod] Neko
Fixed recently it seems.
[Mod] Neko
Did you have cheats enabled?