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Paper optimization is really low

scope: performance

status: needs triage

version: 1.21.11Game version 1.21.11Game version 1.21.11

Status: Open.

Bug

#13827 In PaperMC/Paper;

· pavel444-byte opened on Apr 26, 2026

End Portal not closing

status: needs triage

Status: Open.

Bug

#13822 In PaperMC/Paper;

· S1MMYOG opened on Apr 25, 2026

villager spawner spawn Villagers that don't take items from the ground

status: needs triage

version: 1.21.11Game version 1.21.11Game version 1.21.11

Status: Open.

Bug

#13809 In PaperMC/Paper;

· homerek111 opened on Apr 21, 2026

Server No response on 0 seconds

status: needs triage

version: 1.21.11Game version 1.21.11Game version 1.21.11

Status: Open.

Bug

#13806 In PaperMC/Paper;

· pavel444-byte opened on Apr 21, 2026

Toggling a redstone comparator in a specific contraption throws an exception

status: needs triage

upstream: vanillaIssue exists in vanilla Minecraft.Issue exists in vanilla Minecraft.

version: 26.1.2

Status: Open.

Bug

#13805 In PaperMC/Paper;

· youFailerEXE opened on Apr 21, 2026

Add PlayerAdvancementRevokeEvent and PlayerAdvancementCriterionRevokeEvent

status: needs triage

Status: Open.

Feature

#13799 In PaperMC/Paper;

· Doc94 opened on Apr 18, 2026

Feature request: add a way to get the picked block/entity on creative

status: needs triage

Status: Open.

Feature

#13797 In PaperMC/Paper;

· WizardlyBump17 opened on Apr 17, 2026

NbtAccounterException: Tried to read NBT tag with too high complexity, depth > 512

status: needs triage

Status: Open.

Bug

#13795 In PaperMC/Paper;

· Schneidertm opened on Apr 17, 2026

CraftMagicNumbers.loadAdvancement saves advancements to an incorrect folder

status: acceptedDisputed bug is accepted as valid or Feature accepted as desired to be added.Disputed bug is accepted as valid or Feature accepted as desired to be added.

version: 26.1.2

Status: Open.

Bug

#13794 In PaperMC/Paper;

· ShaneBeee opened on Apr 17, 2026

BlockType#isOccluding is incorrectly handled

status: acceptedDisputed bug is accepted as valid or Feature accepted as desired to be added.Disputed bug is accepted as valid or Feature accepted as desired to be added.

Status: Open.

Bug

#13790 In PaperMC/Paper;

· ShaneBeee opened on Apr 14, 2026

Support despawn-time for entities in weakly loaded chunks, resolve lag and crashes from weak chunk entity stacking

status: needs triage

Status: Open.

Feature

#13783 In PaperMC/Paper;

· CatTeaA opened on Apr 13, 2026

Stabbing a block with a spear does not trigger left click event

status: acceptedDisputed bug is accepted as valid or Feature accepted as desired to be added.Disputed bug is accepted as valid or Feature accepted as desired to be added.

version: 26.1.2

Status: Open.

Bug

#13779 In PaperMC/Paper;

· bluelhf opened on Apr 12, 2026