[1.13-pre10] fatal error has been detected by the Java Runtime Environment

[18w22c] [STDERR]: java.lang.NullPointerException

[18w22c] Exception in server tick loop java.lang.OutOfMemoryError: Java heap space

[18w21a] Grass spawns in mid air

[18w21a] Exception ticking world

Loading 18w16a worlds in 18w19b: [WorldGen-Worker-1/ERROR]: Couldn't load chunk

[18w11a] minecraft:drowned Ticking entity crashing server

[18w08b] java.lang.NullPointerException: Tesselating block in world

/spreadplayers can put you inside a wall with high spread distance values

Stack Overflow in /data get entity

[17w49b] Client thread/FATAL: Non [a-z0-9/._-] character in path of location

[1.12] Redstone/Observer/Piston - Observer detects. Redstone lights up. Piston does not fire

1.12-PRE1 doLimitedCrafting(true) Recipes not unlocking.

17w18b Advancement 'Serious Dedication' is triggered when any tool breaks. Not just Diamond Hoe

17w15a Sever does not start!

17w14a doLimitedCrafting(true) Changing gamemode to Adventure Mode and back to Survival breaks crafting

17w14a Compass points to world spawn and not bed spawn.

17w14a doLimitedCrafting(true) Unable to repair tools/armor

17w14a STDOUT spam when hurting/killing mobs

17w14a doLimitedCrafting(true) Crafting Based duplication

17w14a doLimitedCrafting(true) returns FATAL ERROR on servers when recipe should unlock

17w13b Parrots do not spawn naturally. Manually spawned parrots do not breed.

17w13a Crafting is not possible/Recipes do not unlock

17w13a Advancements window is empty/transparent

Item frames disappear/become invisible.

Redstone Charge no longer passes thru Command Block (16w42a)