Rendering Wither crashes the game

[turtletowerz]

Happens with fabric-1.8.9 version 0.8.2+build.202004210808. When attempting to join multiplayer servers with the Wither spawned in (eg. Hypixel or Mineplex), the client immediately crashes. Spawning a Wither in singleplayer will also crash it. The stack trace for the crash report can be found below

---- Minecraft Crash Report ----
// Why did you do that?

Time: 8/9/20 9:09 PM
Description: Rendering entity in world

java.lang.AbstractMethodError: net.minecraft.class_1880.f_()Lnet/minecraft/class_1444;
    at net.minecraft.class_1001.method_3301(class_1001.java:15)
    at net.minecraft.class_1179.method_4073(class_1179.java:23)
    at net.minecraft.class_1179.method_3910(class_1179.java:11)
    at net.minecraft.class_1135.method_3891(class_1135.java:295)
    at net.minecraft.class_1135.method_3893(class_1135.java:260)
    at net.minecraft.class_1135.method_3892(class_1135.java:227)
    at net.minecraft.class_1036.method_3527(class_1036.java:596)
    at net.minecraft.class_1012.method_3359(class_1012.java:1244)
    at net.minecraft.class_1012.method_3369(class_1012.java:1149)
    at net.minecraft.class_1012.method_3356(class_1012.java:1002)
    at net.minecraft.class_669.method_2286(class_669.java:915)
    at net.minecraft.class_669.method_2247(class_669.java:325)
    at net.minecraft.client.main.Main.main(Main.java:124)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:497)
    at net.fabricmc.loader.game.MinecraftGameProvider.launch(MinecraftGameProvider.java:194)
    at net.fabricmc.loader.launch.knot.Knot.init(Knot.java:140)
    at net.fabricmc.loader.launch.knot.KnotClient.main(KnotClient.java:26)

A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------

-- Head --
Stacktrace:
    at net.minecraft.class_1001.method_3301(class_1001.java:15)
    at net.minecraft.class_1179.method_4073(class_1179.java:23)
    at net.minecraft.class_1179.method_3910(class_1179.java:11)

-- Entity being rendered --
Details:
    Entity Type: WitherBoss (net.minecraft.class_1880)
    Entity ID: -1234
    Entity Name: §9§lSKYBLOCK TONS OF UPDATES - LIVE
    Entity's Exact location: 8.03, 70.00, -0.53
    Entity's Block location: 8.00,70.00,-1.00 - World: (8,70,-1), Chunk: (at 8,4,15 in 0,-1; contains blocks 0,0,-16 to 15,255,-1), Region: (0,-1; contains chunks 0,-32 to 31,-1, blocks 0,0,-512 to 511,255,-1)
    Entity's Momentum: 0.00, 0.00, 0.00
    Entity's Rider: ~~ERROR~~ NullPointerException: null
    Entity's Vehicle: ~~ERROR~~ NullPointerException: null

-- Renderer details --
Details:
    Assigned renderer: net.minecraft.class_1179@3b60be3
    Location: 32.99,0.00,-0.00 - World: (32,0,-1), Chunk: (at 0,0,15 in 2,-1; contains blocks 32,0,-16 to 47,255,-1), Region: (0,-1; contains chunks 0,-32 to 31,-1, blocks 0,0,-512 to 511,255,-1)
    Rotation: 0.0
    Delta: 0.550724
Stacktrace:
    at net.minecraft.class_1135.method_3891(class_1135.java:295)
    at net.minecraft.class_1135.method_3893(class_1135.java:260)
    at net.minecraft.class_1135.method_3892(class_1135.java:227)
    at net.minecraft.class_1036.method_3527(class_1036.java:596)
    at net.minecraft.class_1012.method_3359(class_1012.java:1244)
    at net.minecraft.class_1012.method_3369(class_1012.java:1149)

[hYdos]

have you tested this in vanilla 1.8.9? what mods are you using?

[turtletowerz]

Vanilla 1.8.9 works fine and no mods are installed.