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Bug
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Resolution: Fixed
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Minor
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None
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None
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None
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General Information
Brand Toshiba Model C55-A5302 Dimensions(WxHxD) 381 x 241 x 35.6 mm Weight 2.4 Kg Colors Satin Black in Trax Horizon Operating System Ubuntu Server 17.04 Operating System Type 64-bit Display Details
Display Size 15.6 Inches (39.62 cm) Display Resolution 1366 x 768 Pixels Display Type LED Display Features HD TruBrite LED Backlit Display Display Touchscreen 
NoPerformance
Processor Intel Pentium Dual Core 2020M Clock-speed 2.4 Ghz Graphic Processor Intel HD Graphics Memory
Capacity 6 GB RAM type DDR3 RAM speed 1600 Mhz Memory Slots 2 Storage
HDD Capacity 500 GB HDD Speed(RPM) 5400 RPM HDD type SATA Battery
Battery Cell 6 Cell Battery type Li-Ion Power Supply 65 W AC Adapter W Battery Life 4 Hrs Networking
Wireless LAN 802.11 b/g/n Ports
USB 3.0 slots 1 USB 2.0 slots 2 SD Card Reader 
Headphone Jack Microphone Jack Multimedia
Web-cam Secondary cam(Rear-facing) NoSpeakers Stereo Speakers In-built Microphone Peripherals
Optical Drive DVD-SuperMulti drive Pointing Device Touchpad with Multi-touch Gesture Support Keyboard Standard Keyboard Others
Warranty 1 Year Lockport Sales Package Laptop, Battery, AC Adapter, User Guide General Information Brand Toshiba Model C55-A5302 Dimensions(WxHxD) 381 x 241 x 35.6 mm Weight 2.4 Kg Colors Satin Black in Trax Horizon Operating System Ubuntu Server 17.04 Operating System Type 64-bit Display Details Display Size 15.6 Inches (39.62 cm) Display Resolution 1366 x 768 Pixels Display Type LED Display Features HD TruBrite LED Backlit Display Display Touchscreen No Performance Processor Intel Pentium Dual Core 2020M Clock-speed 2.4 Ghz Graphic Processor Intel HD Graphics Memory Capacity 6 GB RAM type DDR3 RAM speed 1600 Mhz Memory Slots 2 Storage HDD Capacity 500 GB HDD Speed(RPM) 5400 RPM HDD type SATA Battery Battery Cell 6 Cell Battery type Li-Ion Power Supply 65 W AC Adapter W Battery Life 4 Hrs Networking Wireless LAN 802.11 b/g/n Ports USB 3.0 slots 1 USB 2.0 slots 2 SD Card Reader Headphone Jack Microphone Jack Multimedia Web-cam Secondary cam(Rear-facing) No Speakers Stereo Speakers In-built Microphone Peripherals Optical Drive DVD-SuperMulti drive Pointing Device Touchpad with Multi-touch Gesture Support Keyboard Standard Keyboard Others Warranty 1 Year Lockport Sales Package Laptop, Battery, AC Adapter, User Guide
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This server is running CraftBukkit version git-Spigot-0b44fa0-4 9a2604 (MC: 1.13) (Implementing API version 1.13-R0.1-SNAPSHOT)
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plotsquared, worldedit, uskyblock, askyblock, bskyblock, and my own plugins
This is a very annoying issue that has been going for a while now, it's messing up many plugins because World#regenerateChunk doesn't work and has this stack-trace in console.
I am able to reproduce this issue on a clean test server with freshly generated worlds as well.
The following is an example stack-trace, the error can be reproduced by any plugin on any world on the server.
java.lang.RuntimeException: Error while adding chunk to cache. Too many neighborsjava.lang.RuntimeException: Error while adding chunk to cache. Too many neighbors at net.minecraft.server.v1_13_R1.Chunk.H(Chunk.java:1228) ~[spigot-1.13.jar:git-Spigot-0b44fa0-2100017] at net.minecraft.server.v1_13_R1.ChunkMap.a(ChunkMap.java:27) ~[spigot-1.13.jar:git-Spigot-0b44fa0-2100017] at net.minecraft.server.v1_13_R1.ChunkMap.put(ChunkMap.java:134) ~[spigot-1.13.jar:git-Spigot-0b44fa0-2100017] at net.minecraft.server.v1_13_R1.ChunkMap.put(ChunkMap.java:1) ~[spigot-1.13.jar:git-Spigot-0b44fa0-2100017] at org.bukkit.craftbukkit.libs.it.unimi.dsi.fastutil.longs.Long2ObjectMaps$SynchronizedMap.put(Long2ObjectMaps.java:371) ~[spigot-1.13.jar:git-Spigot-0b44fa0-2100017] at org.bukkit.craftbukkit.v1_13_R1.CraftWorld.regenerateChunk(CraftWorld.java:230) ~[spigot-1.13.jar:git-Spigot-0b44fa0-2100017] at com.plotsquared.bukkit.util.block.BukkitLocalQueue.regenChunk(BukkitLocalQueue.java:61) ~[?:?] at com.intellectualcrafters.plot.generator.HybridPlotManager$1.run(HybridPlotManager.java:169) ~[?:?] at com.intellectualcrafters.plot.generator.HybridPlotManager$1.run(HybridPlotManager.java:164) ~[?:?] at com.intellectualcrafters.plot.object.RunnableVal.run(RunnableVal.java:14) ~[?:?] at com.intellectualcrafters.plot.util.ChunkManager$3.run(ChunkManager.java:182) ~[?:?] at org.bukkit.craftbukkit.v1_13_R1.scheduler.CraftTask.run(CraftTask.java:76) ~[spigot-1.13.jar:git-Spigot-0b44fa0-2100017] at org.bukkit.craftbukkit.v1_13_R1.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:361) [spigot-1.13.jar:git-Spigot-0b44fa0-2100017] at net.minecraft.server.v1_13_R1.MinecraftServer.w(MinecraftServer.java:877) [spigot-1.13.jar:git-Spigot-0b44fa0-2100017] at net.minecraft.server.v1_13_R1.DedicatedServer.w(DedicatedServer.java:411) [spigot-1.13.jar:git-Spigot-0b44fa0-2100017] at net.minecraft.server.v1_13_R1.MinecraftServer.v(MinecraftServer.java:819) [spigot-1.13.jar:git-Spigot-0b44fa0-2100017] at net.minecraft.server.v1_13_R1.MinecraftServer.run(MinecraftServer.java:717) [spigot-1.13.jar:git-Spigot-0b44fa0-2100017] at java.lang.Thread.run(Thread.java:748) [?:1.8.0_171]
Minimal reproduction code attached as a plugin file.
To reproduce the issue, create a brand new test server with no plugins other then this plugin with fresh worlds etc. and type /regen in-game and it will attempt to regenerate the chunk you are standing in.