So from Wurst Client 1.21, there is always been a problem : It may crash randomly sometimes. I thought that this problem would be fixed with the new Wurst Client 1.21, but it seems that it still happens. So yesterday, I had reall bad wifi, so my connection in-game is not that constant and may cause disconnecting. Fortunately, with the help of the autoconnect, It will automatically reconnect me in-game. But for example, I had AFK for the autolibrarian, but it seems that autolibrarian stops working after getting reconnect. (It may just deasctivate itself or it may just still be working but needs to desactivate it first and then reactivate it). And here is the most recent crash report of my minecraft :
-- Head --

Thread: Render thread

Stacktrace:

$$
at net.wurstclient.hacks.MobSpawnEspHack$ChunkScanner.lambda$compileBuffer$4(MobSpawnEspHack.java:315)

at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:197)

at java.base/java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1708)

at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:509)

at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:499)

at java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:151)

at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:174)

at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)

at java.base/java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:596)

at net.wurstclient.hacks.MobSpawnEspHack$ChunkScanner.compileBuffer(MobSpawnEspHack.java:317)

at net.wurstclient.hacks.MobSpawnEspHack.onUpdate(MobSpawnEspHack.java:150)

at net.wurstclient.events.UpdateListener$UpdateEvent.fire(UpdateListener.java:27)

at net.wurstclient.event.EventManager.fireImpl(EventManager.java:69)

at net.wurstclient.event.EventManager.fire(EventManager.java:42)

at net.minecraft.class_746.handler$zod000$wurst$onTick(class_746.java:1880)

at net.minecraft.class_746.method_5773(class_746.java:221)

at net.minecraft.class_638.method_18646(class_638.java:278)

at net.minecraft.class_1937.method_18472(class_1937.java:498)

at net.minecraft.class_638.method_32124(class_638.java:261)

at net.minecraft.class_5574.method_31791(class_5574.java:54)

at net.minecraft.class_638.method_18116(class_638.java:257)
$$

-- Affected event --

Details:

$$
Event class: net.wurstclient.events.UpdateListener$UpdateEvent
$$

Stacktrace:

$$
at net.wurstclient.event.EventManager.fireImpl(EventManager.java:69)

at net.wurstclient.event.EventManager.fire(EventManager.java:42)

at net.minecraft.class_746.handler$zod000$wurst$onTick(class_746.java:1880)

at net.minecraft.class_746.method_5773(class_746.java:221)

at net.minecraft.class_638.method_18646(class_638.java:278)

at net.minecraft.class_1937.method_18472(class_1937.java:498)

at net.minecraft.class_638.method_32124(class_638.java:261)

at net.minecraft.class_5574.method_31791(class_5574.java:54)

at net.minecraft.class_638.method_18116(class_638.java:257)

at net.minecraft.class_310.method_1574(class_310.java:1956)

at net.minecraft.class_310.method_1523(class_310.java:1246)

at net.minecraft.class_310.method_1514(class_310.java:882)

at net.minecraft.client.main.Main.main(Main.java:256)

at net.fabricmc.loader.impl.game.minecraft.MinecraftGameProvider.launch(MinecraftGameProvider.java:470)

at net.fabricmc.loader.impl.launch.knot.Knot.launch(Knot.java:74)

at net.fabricmc.loader.impl.launch.knot.KnotClient.main(KnotClient.java:23)
$$

-- Entity being ticked --

Details:

$$
Entity Type: minecraft:player (net.minecraft.class_746)

Entity ID: 54016

Entity Name: HappyLittleBoy

Entity's Exact location: 209.37, 242.00, 792.35

Entity's Block location: World: (209,242,792), Section: (at 1,2,8 in 13,15,49; chunk contains blocks 208,-64,784 to 223,319,799), Region: (0,1; contains chunks 0,32 to 31,63, blocks 0,-64,512 to 511,319,1023)

Entity's Momentum: -0.00, -0.08, 0.04

Entity's Passengers: []

Entity's Vehicle: null
$$

Stacktrace:

$$
at net.minecraft.class_1937.method_18472(class_1937.java:498)

at net.minecraft.class_638.method_32124(class_638.java:261)

at net.minecraft.class_5574.method_31791(class_5574.java:54)

at net.minecraft.class_638.method_18116(class_638.java:257)

at net.minecraft.class_310.method_1574(class_310.java:1956)

at net.minecraft.class_310.method_1523(class_310.java:1246)

at net.minecraft.class_310.method_1514(class_310.java:882)

at net.minecraft.client.main.Main.main(Main.java:256)

at net.fabricmc.loader.impl.game.minecraft.MinecraftGameProvider.launch(MinecraftGameProvider.java:470)

at net.fabricmc.loader.impl.launch.knot.Knot.launch(Knot.java:74)

at net.fabricmc.loader.impl.launch.knot.KnotClient.main(KnotClient.java:23)
$$

-- Uptime --

Details:

$$
JVM uptime: 287.371s

Wall uptime: 257.470s

High-res time: 253.937s

Client ticks: 4747 ticks / 237.350s
$$

Stacktrace:

$$
at net.minecraft.class_310.method_1587(class_310.java:2501)

at net.minecraft.class_310.method_54580(class_310.java:949)

at net.minecraft.class_310.method_1514(class_310.java:902)

at net.minecraft.client.main.Main.main(Main.java:256)

at net.fabricmc.loader.impl.game.minecraft.MinecraftGameProvider.launch(MinecraftGameProvider.java:470)

at net.fabricmc.loader.impl.launch.knot.Knot.launch(Knot.java:74)

at net.fabricmc.loader.impl.launch.knot.KnotClient.main(KnotClient.java:23)
$$

-- Affected level --

Details:

$$
All players: 1 total; [class_746['HappyLittleBoy'/54016, l='ClientLevel', x=209.37, y=242.00, z=792.35]]

Chunk stats: 729, 453

Level dimension: minecraft:overworld

Level spawn location: World: (64,92,0), Section: (at 0,12,0 in 4,5,0; chunk contains blocks 64,-64,0 to 79,319,15), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,-64,0 to 511,319,511)

Level time: 48201051 game time, 50209390 day time

Server brand: vanilla

Server type: Non-integrated multiplayer server

Tracked entity count: 342
$$

-- Last reload --

Details:

$$
Reload number: 1

Reload reason: initial

Finished: Yes

Packs: fabric, fabric-api, fabric-api-base, fabric-api-lookup-api-v1, fabric-biome-api-v1, fabric-block-api
$$