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High altitude mob spawning inconsistencies

High-pitched sound when selecting Singleplayer, Multiplayer, etc.

Nametag of certain mobs too low / too high

Hi-res texture pack clouds have garbage on edges

Too many minecarts with TNT at once (500+) explode by themselves.

Uncapped framerate in certain screens causes high levels of GPU usage.

Disappear above cloud level

Coil Whine in minecraft menus (whiny noise from graphics card)

Mouse Sensitivity Issue With Menus

/setblock command crashes minecraft

Dark Outside Lighting

Server fills allocated memory and results in severe lag.

Streaming with twitch causes text to bug with high stream compression

High CPU load on superflat

[Server] Extreme usage of RAM after some hours of playing

Mobs repetitively despawn and respawn rapidly at high Y coordinates (causing lag)

Player spawned at wrong altitude and falls from a height when reloading the world

Chest remains open when high above the player

Abnormally very high RAM usage since 1.13 (client side)