MC-73881

Summoning monsters in peaceful difficulty spawns monster for 1 tick

The bug

When you summon a monster, it does not only flash, but also really exists for one tick. This may cause unnecessary CPU usage because the pathfinding algorithm maybe already starts.

How to reproduce

Set difficulty to peaceful
Place a command block with this command: /summon zombie ~ ~1 ~
Place a chain command block after it with this command: /execute if entity @e[type=minecraft:zombie,distance=..4] run say ZOMBIE DETECTED
Activate the first command block
→ Observe how the command block said "ZOMBIE DETECTED"

Status:Unresolved

Reporter:Connor Steppie

Creator:Marcono1234

Created:2014-10-31, 06:14 PM

Updated:2024-12-04, 02:57 PM

Votes:28

Watchers:14

Confirmation Status:Confirmed

Mojang Priority:Low

Category:Mob spawning

Labels:/summon, difficulty, mixed-bugs-hallway, monster, peaceful, spawn, tick

Affects Versions:

Minecraft 1.8.1-pre3 - 1.20.4

Minecraft 1.8.1-pre3, Minecraft 16w05a, Minecraft 16w40a, Minecraft 1.11.2, Minecraft 1.13.1, Minecraft 1.13.2, Minecraft 19w12b, Minecraft 19w13b, Minecraft 19w14a, Minecraft 19w14b, 1.15.2, 20w07a, 20w08a, 20w09a, 20w10a, 20w11a, 20w12a, 20w13a, 20w21a, 1.16 Pre-release 2, 1.16 Pre-release 3, 1.16 Pre-release 5, 20w28a, 20w29a, 20w30a, 1.16.2 Pre-release 1, 1.16.2, 1.16.3, 20w46a, 20w51a, 21w03a, 1.16.5, 21w05b, 21w06a, 21w07a, 21w08b, 21w15a, 21w17a, 21w20a, 1.17 Pre-release 1, 1.17.1, 1.18.1, 1.18.2, 1.19, 1.19.1, 1.19.2, 1.20.3 Release Candidate 1, 1.20.4

Fix Versions:-