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Issue Description: Dynmap semi-crashes at the server startup (NoSuchMethodError and unable to access to commands).

• Dynmap Version: 3.7 /s948
• Server Version: CraftBukkit version 4358-Spigot-5eb8a94-6bb0db5 (MC: 1.21.3) (Implementing API version 1.21.3-R0.1-SNAPSHOT)
• Pastebin of Configuration.txt: https://pastebin.com/p1Vhcmab
• Server Host (if applicable): OVH
• Pastebin of crashlogs or other relevant logs: https://pastebin.com/bitxqhUf
• Other Relevant Data/Screenshots: /
• Steps to Replicate: Rebuilt with the recent official BuildTools.jar file and upgraded the Spigot server from 1.21.2 to 1.21.3 yesterday

[x] I have looked at all other issues and this is not a duplicate
[x] I have been able to replicate this

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(encountering same error)

ditto!

Also having this issue.

INFO22:24:33 [dynmap]: Enabling dynmap v3.7-SNAPSHOT-948 ERROR22:24:33 Error occurred while enabling dynmap v3.7-SNAPSHOT-948 (Is it up to date?) Console22:24:33 java.lang.NoSuchMethodError: 'int net.minecraft.world.level.block.state.BlockState.b(net.minecraft.world.level.BlockGetter, net.minecraft.core.BlockPos)' at Dynmap-3.7-beta-7-spigot.jar/org.dynmap.bukkit.helper.v121.BukkitVersionHelperSpigot121.initializeBlockStates(BukkitVersionHelperSpigot121.java:184) ~[Dynmap-3.7-beta-7-spigot.jar:?] at Dynmap-3.7-beta-7-spigot.jar/org.dynmap.bukkit.DynmapPlugin.onEnable(DynmapPlugin.java:933) ~[Dynmap-3.7-beta-7-spigot.jar:?] at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:288) ~[paper-api-1.21.3-R0.1-SNAPSHOT.jar:?] at io.papermc.paper.plugin.manager.PaperPluginInstanceManager.enablePlugin(PaperPluginInstanceManager.java:202) ~[paper-1.21.3.jar:1.21.3-10-92131ad] at io.papermc.paper.plugin.manager.PaperPluginManagerImpl.enablePlugin(PaperPluginManagerImpl.java:109) ~[paper-1.21.3.jar:1.21.3-10-92131ad] at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:520) ~[paper-api-1.21.3-R0.1-SNAPSHOT.jar:?] at org.bukkit.craftbukkit.CraftServer.enablePlugin(CraftServer.java:643) ~[paper-1.21.3.jar:1.21.3-10-92131ad] at org.bukkit.craftbukkit.CraftServer.enablePlugins(CraftServer.java:592) ~[paper-1.21.3.jar:1.21.3-10-92131ad] at net.minecraft.server.MinecraftServer.loadWorld0(MinecraftServer.java:767) ~[paper-1.21.3.jar:1.21.3-10-92131ad] at net.minecraft.server.MinecraftServer.loadLevel(MinecraftServer.java:529) ~[paper-1.21.3.jar:1.21.3-10-92131ad] at net.minecraft.server.dedicated.DedicatedServer.initServer(DedicatedServer.java:326) ~[paper-1.21.3.jar:1.21.3-10-92131ad] at net.minecraft.server.MinecraftServer.runServer(MinecraftServer.java:1233) ~[paper-1.21.3.jar:1.21.3-10-92131ad] at net.minecraft.server.MinecraftServer.lambda$spin$0(MinecraftServer.java:339) ~[paper-1.21.3.jar:1.21.3-10-92131ad] at java.base/java.lang.Thread.run(Thread.java:1583) ~[?:?] INFO22:24:33 [dynmap]: Disabling dynmap v3.7-SNAPSHOT-948 ERROR22:24:33 Error occurred while disabling dynmap v3.7-SNAPSHOT-948 Console22:24:33 java.lang.NullPointerException: Cannot invoke "org.dynmap.DynmapCore.disableCore()" because "this.core" is null at Dynmap-3.7-beta-7-spigot.jar/org.dynmap.bukkit.DynmapPlugin.onDisable(DynmapPlugin.java:1094) ~[Dynmap-3.7-beta-7-spigot.jar:?] at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:291) ~[paper-api-1.21.3-R0.1-SNAPSHOT.jar:?] at io.papermc.paper.plugin.manager.PaperPluginInstanceManager.disablePlugin(PaperPluginInstanceManager.java:237) ~[paper-1.21.3.jar:1.21.3-10-92131ad] at io.papermc.paper.plugin.manager.PaperPluginManagerImpl.disablePlugin(PaperPluginManagerImpl.java:114) ~[paper-1.21.3.jar:1.21.3-10-92131ad] at org.bukkit.plugin.SimplePluginManager.disablePlugin(SimplePluginManager.java:550) ~[paper-api-1.21.3-R0.1-SNAPSHOT.jar:?] at io.papermc.paper.plugin.manager.PaperPluginInstanceManager.enablePlugin(PaperPluginInstanceManager.java:206) ~[paper-1.21.3.jar:1.21.3-10-92131ad] at io.papermc.paper.plugin.manager.PaperPluginManagerImpl.enablePlugin(PaperPluginManagerImpl.java:109) ~[paper-1.21.3.jar:1.21.3-10-92131ad] at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:520) ~[paper-api-1.21.3-R0.1-SNAPSHOT.jar:?] at org.bukkit.craftbukkit.CraftServer.enablePlugin(CraftServer.java:643) ~[paper-1.21.3.jar:1.21.3-10-92131ad] at org.bukkit.craftbukkit.CraftServer.enablePlugins(CraftServer.java:592) ~[paper-1.21.3.jar:1.21.3-10-92131ad] at net.minecraft.server.MinecraftServer.loadWorld0(MinecraftServer.java:767) ~[paper-1.21.3.jar:1.21.3-10-92131ad] at net.minecraft.server.MinecraftServer.loadLevel(MinecraftServer.java:529) ~[paper-1.21.3.jar:1.21.3-10-92131ad] at net.minecraft.server.dedicated.DedicatedServer.initServer(DedicatedServer.java:326) ~[paper-1.21.3.jar:1.21.3-10-92131ad] at net.minecraft.server.MinecraftServer.runServer(MinecraftServer.java:1233) ~[paper-1.21.3.jar:1.21.3-10-92131ad] at net.minecraft.server.MinecraftServer.lambda$spin$0(MinecraftServer.java:339) ~[paper-1.21.3.jar:1.21.3-10-92131ad] at java.base/java.lang.Thread.run(Thread.java:1583) ~[?:?]

Same here, I reported on Reddit a few days ago.

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Edit -
Commented before fully reading all the subsequent posts. The .jar attached to the PR jacob1 linked works for me.

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There is a subscribe button on the right, no need to spam bugreports with this :)

My dynmap crashes with this on startup:

[Server thread/INFO]: This server is running CraftBukkit version 4378-Spigot-e65d67a-8ef9079 (MC: 1.21.3) (Implementing API version 1.21.3-R0.1-SNAPSHOT)
[Server thread/INFO]: [dynmap] Enabling dynmap v3.7-SNAPSHOT-948
[Server thread/INFO]: Send: Error occurred while enabling dynmap v3.7-SNAPSHOT-948 (Is it up to date?)
[Server thread/ERROR]: Error occurred while enabling dynmap v3.7-SNAPSHOT-948 (Is it up to date?)
java.lang.NoSuchMethodError: 'int net.minecraft.world.level.block.state.IBlockData.b(net.minecraft.world.level.IBlockAccess, net.minecraft.core.BlockPosition)'
at org.dynmap.bukkit.helper.v121.BukkitVersionHelperSpigot121.initializeBlockStates(BukkitVersionHelperSpigot121.java:184) ~[?:?]
at org.dynmap.bukkit.DynmapPlugin.onEnable(DynmapPlugin.java:933) ~[?:?]
at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:267) ~[spigot-api-1.21.3-R0.1-SNAPSHOT.jar:?]
at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:342) ~[spigot-api-1.21.3-R0.1-SNAPSHOT.jar:?]
at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:492) ~[spigot-api-1.21.3-R0.1-SNAPSHOT.jar:?]
at org.bukkit.craftbukkit.v1_21_R2.CraftServer.enablePlugin(CraftServer.java:579) ~[spigot-1.21.3-R0.1-SNAPSHOT.jar:4378-Spigot-e65d67a-8ef9079]
at org.bukkit.craftbukkit.v1_21_R2.CraftServer.enablePlugins(CraftServer.java:493) ~[spigot-1.21.3-R0.1-SNAPSHOT.jar:4378-Spigot-e65d67a-8ef9079]
at net.minecraft.server.MinecraftServer.loadWorld0(MinecraftServer.java:656) ~[spigot-1.21.3-R0.1-SNAPSHOT.jar:4378-Spigot-e65d67a-8ef9079]
at net.minecraft.server.MinecraftServer.loadLevel(MinecraftServer.java:441) ~[spigot-1.21.3-R0.1-SNAPSHOT.jar:4378-Spigot-e65d67a-8ef9079]
at net.minecraft.server.dedicated.DedicatedServer.e(DedicatedServer.java:268) ~[spigot-1.21.3-R0.1-SNAPSHOT.jar:4378-Spigot-e65d67a-8ef9079]
at net.minecraft.server.MinecraftServer.y(MinecraftServer.java:1032) ~[spigot-1.21.3-R0.1-SNAPSHOT.jar:4378-Spigot-e65d67a-8ef9079]
at net.minecraft.server.MinecraftServer.lambda$spin$0(MinecraftServer.java:329) ~[spigot-1.21.3-R0.1-SNAPSHOT.jar:4378-Spigot-e65d67a-8ef9079]
at java.base/java.lang.Thread.run(Thread.java:1583) [?:?]

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Literally not necessary, just press a button.

There's a PR that fixes it here: #4164

And a .jar download too for anyone who needs it.