ForestOfLight

Yep! We can access setGameMode() through a custom command like this:

import { system, CustomCommandParamType, CommandPermissionLevel } from "@minecraft/server";

system.beforeEvents.startup.subscribe((event) => {
    event.customCommandRegistry.registerCommand({
        name: 'debug:setgamemode',
        description: "Changes your gamemode using the Script API instead of the vanilla command.",
        mandatoryParameters: [{ name: "gamemode", type: CustomCommandParamType.String }],
        permissionLevel: CommandPermissionLevel.Any,
        cheatsRequired: false
    }, gamemodeCmdCallback);
});

function gamemodeCmdCallback(origin, gamemode) {
    const source = origin.sourceEntity;
    system.run(() => origin.sourceEntity.setGameMode(gamemode));
};

Upon using this command with the desired gamemodes in hardcore mode, we can see that the only gamemode change that works is Survival → Spectator.

Instead of dropping as an item, it would make the most sense for tridents to stay around and continue to damage mobs.

Also applies to the copper grate.

Affects 1.21.120. Comparators don’t get powered in any direction by item frames on the floor or ceiling.

Fixed on Win10 with the switch to GDK in 1.21.120.

Relates to or duplicates MCPE-176853

Also affects the ScriptAPI and /fill.

This single bug is the reason why redstoners don’t use structure blocks. Especially for players making slimestone flying machines, one-time-use tests are common during the development process. When flying machines are loaded with a structure block, the observers all fire at once, breaking the machine. It would be great to be able to use structure blocks for redstone!

Not sure why this was marked WAI. Still affects 1.21.120.

While it’s a decent solution for now, this solution does not ensure that ender pearls do not despawn when thrown outside of loaded chunks. Sometimes (especially if the pearl is travelling fast enough), it can still despawn when crossing chunk borders.

Fixed in 1.21.100 stable

• Fixing a crash with the DebugDrawer when used too early in the client joining a world (such as inside the playerSpawn event).

I should also mention this is a huge issue on BDS because any drawn shapes will stick around after a player leaves, meaning they will not be able to rejoin.

The locator bar can be disabled with the locatorbar gamerule.

Observed TPS drop when the bottom of the ghast touches the ground:

Testing shows that the trident’s hit “margin” is not expanded fully when on the ground and/or if it gets velocity after landing. When used in a trident killer, the larger “margin” is needed to hit mobs through trapdoors, since trapdoors are thicker than the hurtbox of tridents, but less thick than the expanded 0.3 block margin. This is why they worked in the past – the 0.3 margin was always active.

Proposed solution:

Use the trident’s spawn time as the start of the margin expansion instead of anytime it gets velocity.

Still affects 1.21.83.

This also affects elytras not taking durability damage in survival, and the player gets hungry far less often – perhaps only when they take damage.

This is working as intended. @minecraft/server-net can only be added to BDS instances.

One theory about this is that the raycast uses the center of the head as its origin, which works great for most entities. However, since the first-person view of the player is slightly above the center of the head, the raycast is further down than it should be.