I would have reopened that issue with this, but I don't have permissions to re-open issues it seems. Here's some screenshots of the issue and of my instance setup:
-- Affected level --
Details:
All players: 1 total; class_746{name=Trans_Rightss, id=1, pos=(-4.326749084948546, 56.0, -3.0915017857053546), mode=CREATIVE, permission=permission level: OWNERS}
Chunk stats: 1521, 1057
Level dimension: minecraft:overworld
Level spawn location: World: (0,56,0), Section: (at 0,8,0 in 0,3,0; chunk contains blocks 0,-64,0 to 15,319,15), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,-64,0 to 511,319,511)
Level time: 4989 game time, 4989 day time
Server brand: fabric
Server type: Integrated singleplayer server
Tracked entity count: 1
-- Last reload --
Details:
Reload number: 1
Reload reason: initial
Finished: Yes
Packs: vanilla, create
-- System Details --
Details:
Minecraft Version: 1.21.11
Minecraft Version ID: 1.21.11
Operating System: Mac OS X (aarch64) version 15.2
Java Version: 21.0.3, Microsoft
Java VM Version: OpenJDK 64-Bit Server VM (mixed mode), Microsoft
Memory: 199146616 bytes (189 MiB) / 1321205760 bytes (1260 MiB) up to 4294967296 bytes (4096 MiB)
CPUs: 10
Processor Vendor: Apple Inc.
Processor Name: Apple M1 Pro
Identifier: Apple Inc. Family 0x1b588bb3 Model 0 Stepping 0
Microarchitecture: ARM64 SoC: Firestorm + Icestorm
Frequency (GHz): 3.23
Number of physical packages: 1
Number of physical CPUs: 10
Number of logical CPUs: 10
Graphics card #0 name: Apple M1 Pro
Graphics card #0 vendor: Apple (0x106b)
Graphics card #0 VRAM (MiB): 0.00
Graphics card #0 deviceId: unknown
Graphics card #0 versionInfo: unknown
Memory slot #0 capacity (MiB): 0.00
Memory slot #0 clockSpeed (GHz): 0.00
Memory slot #0 type: unknown
Virtual memory max (MiB): 41984.00
Virtual memory used (MiB): 33306.88
Swap memory total (MiB): 9216.00
Swap memory used (MiB): 8262.31
Space in storage for jna.tmpdir (MiB): <path not set>
Space in storage for org.lwjgl.system.SharedLibraryExtractPath (MiB): <path not set>
Space in storage for io.netty.native.workdir (MiB): <path not set>
Space in storage for java.io.tmpdir (MiB): available: 71321.91, total: 948584.19
Space in storage for workdir (MiB): available: 71321.91, total: 948584.19
JVM Flags: 2 total; -Xms512m -Xmx4096m
Debug Flags: 0 total;
Launched Version: 1.21.11
Launcher name: PrismLauncher
Backend library: LWJGL version 3.3.3-snapshot
Backend API: Apple M1 Pro GL version 4.1 Metal - 89.3, Apple
Window size: 2560x1297
GFLW Platform: cocoa
Render Extensions: GL_EXT_texture_filter_anisotropic
GL debug messages: <debugging unavailable>
Is Modded: Definitely; Client brand changed to 'fabric'; Server brand changed to 'fabric'
Universe: 400921fb54442d18
Type: Integrated Server (map_client.txt)
GPU Warnings: version: Metal
Transparency: regular
Render Distance: 16/16 chunks
Resource Packs: vanilla, create
Current Language: en_us
Locale: en_US
System encoding: UTF-8
File encoding: UTF-8
CPU: 10x Apple M1 Pro
Server Running: true
Player Count: 1 / 8; [class_3222['Trans_Rightss'/1, l='ServerLevel[New World]', x=-4.33, y=56.00, z=-3.09]]
Active Data Packs: vanilla, create, fabric-convention-tags-v2
Available Data Packs: create, fabric-convention-tags-v2, minecart_improvements, redstone_experiments, trade_rebalance, vanilla
Enabled Feature Flags: minecraft:vanilla
World Generation: Stable
World Seed: -8890600768495852582
Suppressed Exceptions: ~~NONE~~
Hello!
After having the same issue and seeing #181 where someone reported it (but @ZurrTum was unable to reproduce the issue), I was able to reproduce the issue in a barebones fresh MC instance, with nothing except Create Fly installed (not even fabric-api, only create fly), on a single-player superflat world ('redstone ready' preset) just to get rid of any other possible cause of the bug.
I would have reopened that issue with this, but I don't have permissions to re-open issues it seems. Here's some screenshots of the issue and of my instance setup:
Info that might help, from a crash report (just held F3+C to get it):