Paper refuses to start after deleting world_gen_settings.dat file #14066

[21:24:42 INFO]: [bootstrap] Running Java 25 (Java HotSpot(TM) 64-Bit Server VM 25.0.3+9-LTS-jvmci-b01; Oracle Corporation Oracle GraalVM 25.0.3+9.1) on Linux 7.0.12-arch1-1 (amd64)
[21:24:42 INFO]: [bootstrap] Loading Paper 26.2-DEV (2026-07-14T19:24:42Z) for Minecraft 26.2
[21:24:43 INFO]: [PluginInitializerManager] Initializing plugins...
[21:24:44 INFO]: [PluginInitializerManager] Initialized 2 plugins
[21:24:44 INFO]: [PluginInitializerManager] Paper plugins (1):
 - Paper-Test-Plugin (1.0.0-SNAPSHOT)
[21:24:44 INFO]: [PluginInitializerManager] Bukkit plugins (1):
 - Debuggery (1.5.1)
WARNING: A restricted method in java.lang.System has been called
WARNING: java.lang.System::load has been called by org.jline.nativ.JLineNativeLoader in an unnamed module (file:/home/strokk/.gradle/caches/modules-2/files-2.1/org.jline/jline-native/3.27.1/d0b198908023385a089379a1c854aadc7a7dd99b/jline-native-3.27.1.jar)
WARNING: Use --enable-native-access=ALL-UNNAMED to avoid a warning for callers in this module
WARNING: Restricted methods will be blocked in a future release unless native access is enabled

2026-07-14T19:24:42.592606766Z main WARN Advanced terminal features are not available in this environment
WARNING: A terminally deprecated method in sun.misc.Unsafe has been called
WARNING: sun.misc.Unsafe::objectFieldOffset has been called by org.joml.MemUtil$MemUtilUnsafe (file:/home/strokk/.gradle/caches/modules-2/files-2.1/org.joml/joml/1.10.8/fc0a71dad90a2cf41d82a76156a0e700af8e4f8d/joml-1.10.8.jar)
WARNING: Please consider reporting this to the maintainers of class org.joml.MemUtil$MemUtilUnsafe
WARNING: sun.misc.Unsafe::objectFieldOffset will be removed in a future release
[21:24:46 INFO]: Environment: Environment[sessionHost=https://sessionserver.mojang.com, servicesHost=https://api.minecraftservices.com, profilesHost=https://api.mojang.com, name=PROD]
[21:24:46 WARN]: [WorldFolderMigration] ===================== ! ALERT ! =====================
[21:24:46 WARN]: [WorldFolderMigration] World storage migration is required during startup.
[21:24:46 WARN]: [WorldFolderMigration] If you do not have a backup: interrupt the server now. Use Ctrl+C, your panel kill function, etc.
[21:24:46 WARN]: [WorldFolderMigration] =====================================================
[21:24:46 WARN]: [WorldFolderMigration] Continuing in 30 seconds...
[21:24:46 WARN]: [WorldFolderMigration] Migration delay disabled by system property.
[21:24:46 INFO]: [WorldFolderMigration] Continuing with startup world migration.
[21:24:46 INFO]: [VanillaWorldMigration] Starting Vanilla import for world 'world' (minecraft:overworld)
[21:24:46 INFO]: [VanillaWorldMigration] Completed Vanilla import for world 'world' (minecraft:overworld)
[21:24:46 ERROR]: Unable to read or access the world gen settings file! Falling back to the default settings with a random world seed. ./world/dimensions/minecraft/overworld/data/minecraft/world_gen_settings.dat
[21:24:46 WARN]: Failed to load datapacks, can't proceed with server load. You can either fix your datapacks or reset to vanilla with --safeMode
java.util.concurrent.ExecutionException: java.lang.IllegalStateException: Overworld settings missing
	at java.base/java.util.concurrent.CompletableFuture.wrapInExecutionException(CompletableFuture.java:345) ~[?:?]
	at java.base/java.util.concurrent.CompletableFuture.reportGet(CompletableFuture.java:440) ~[?:?]
	at java.base/java.util.concurrent.CompletableFuture.get(CompletableFuture.java:2094) ~[?:?]
	at net.minecraft.server.Main.main(Main.java:287) ~[main/:?]
	at io.papermc.paper.PaperBootstrap.boot(PaperBootstrap.java:21) ~[main/:?]
	at org.bukkit.craftbukkit.Main.main(Main.java:204) ~[main/:?]
Caused by: java.lang.IllegalStateException: Overworld settings missing
	at net.minecraft.world.level.levelgen.WorldDimensions.<init>(WorldDimensions.java:47) ~[main/:?]
	at net.minecraft.world.level.levelgen.WorldDimensions.<init>(WorldDimensions.java:52) ~[main/:?]
	at net.minecraft.world.level.storage.LevelStorageSource.lambda$getLevelDataAndDimensions$0(LevelStorageSource.java:163) ~[main/:?]
	at com.mojang.serialization.DataResult$Error.mapOrElse(DataResult.java:309) ~[datafixerupper-10.0.21.jar:?]
	at net.minecraft.world.level.storage.LevelStorageSource.getLevelDataAndDimensions(LevelStorageSource.java:156) ~[main/:?]
	at net.minecraft.server.Main.lambda$main$1(Main.java:271) ~[main/:?]
	at net.minecraft.server.WorldLoader.lambda$load$2(WorldLoader.java:56) ~[main/:?]
	at java.base/java.util.concurrent.CompletableFuture$UniCompose.tryFire(CompletableFuture.java:1171) ~[?:?]
	at java.base/java.util.concurrent.CompletableFuture$Completion.exec(CompletableFuture.java:504) ~[?:?]
	at java.base/java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:511) ~[?:?]
	at java.base/java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(ForkJoinPool.java:1450) ~[?:?]
	at java.base/java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:2019) ~[?:?]
	at java.base/java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:187) ~[?:?]