Not loading with paper 1.21.4 and dynmap v3.7-SNAPSHOT-968

[NODeeJay]

Describe the bug
paper 1.21.4 and dynmap v3.7-SNAPSHOT-968 produces the following error:

[19:44:56] [Server thread/INFO]: [dynmap-structures] Enabling dynmap-structures v2.6.0
[19:44:56] [Server thread/ERROR]: Error occurred while enabling dynmap-structures v2.6.0 (Is it up to date?)
java.lang.ArrayIndexOutOfBoundsException: Index 65 out of bounds for length 65
	at DynmapStructures-2.6.0.jar/com.kovuthehusky.dynmap.structures.DynmapStructuresPlugin.onEnable(DynmapStructuresPlugin.java:425) ~[DynmapStructures-2.6.0.jar:?]
	at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:284) ~[paper-api-1.21.4-R0.1-SNAPSHOT.jar:?]
	at io.papermc.paper.plugin.manager.PaperPluginInstanceManager.enablePlugin(PaperPluginInstanceManager.java:202) ~[paper-1.21.4.jar:1.21.4-121-88bbead]
	at io.papermc.paper.plugin.manager.PaperPluginManagerImpl.enablePlugin(PaperPluginManagerImpl.java:109) ~[paper-1.21.4.jar:1.21.4-121-88bbead]
	at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:520) ~[paper-api-1.21.4-R0.1-SNAPSHOT.jar:?]
	at org.bukkit.craftbukkit.CraftServer.enablePlugin(CraftServer.java:656) ~[paper-1.21.4.jar:1.21.4-121-88bbead]
	at org.bukkit.craftbukkit.CraftServer.enablePlugins(CraftServer.java:605) ~[paper-1.21.4.jar:1.21.4-121-88bbead]
	at net.minecraft.server.MinecraftServer.loadWorld0(MinecraftServer.java:743) ~[paper-1.21.4.jar:1.21.4-121-88bbead]
	at net.minecraft.server.MinecraftServer.loadLevel(MinecraftServer.java:488) ~[paper-1.21.4.jar:1.21.4-121-88bbead]
	at net.minecraft.server.dedicated.DedicatedServer.initServer(DedicatedServer.java:322) ~[paper-1.21.4.jar:1.21.4-121-88bbead]
	at net.minecraft.server.MinecraftServer.runServer(MinecraftServer.java:1163) ~[paper-1.21.4.jar:1.21.4-121-88bbead]
	at net.minecraft.server.MinecraftServer.lambda$spin$2(MinecraftServer.java:310) ~[paper-1.21.4.jar:1.21.4-121-88bbead]
	at java.base/java.lang.Thread.run(Unknown Source) ~[?:?]
[19:44:56] [Server thread/INFO]: [dynmap-structures] Disabling dynmap-structures v2.6.0
[19:44:56] [Server thread/INFO]: [Dynmap-WorldGuard] Enabling Dynmap-WorldGuard v1.4-SNAPSHOT
[19:44:56] [Server thread/INFO]: [Dynmap-WorldGuard] initializing
[19:44:56] [Server thread/INFO]: [Dynmap-WorldGuard] version 1.4-SNAPSHOT is activated
[19:44:56] [Server thread/INFO]: [dynmap-mobs] Enabling dynmap-mobs v1.9.1
[19:44:56] [Server thread/INFO]: [dynmap-mobs] initializing
[19:44:56] [Server thread/INFO]: [dynmap-mobs] Layer for mo'creatures mobs disabled
[19:44:56] [Server thread/INFO]: [dynmap-mobs] Layer for hostile mobs enabled
[19:44:56] [Server thread/INFO]: [dynmap-mobs] Layer for passive mobs enabled
[19:44:56] [Server thread/INFO]: [dynmap-mobs] Layer for vehicles enabled
[19:44:56] [Server thread/INFO]: [dynmap-mobs] Update check enabled
[19:44:56] [Server thread/INFO]: [dynmap-mobs] Activated

other dynmap plugins work fine

To Reproduce
Steps to reproduce the behavior:

1. run paper 1.21.4 with dynmap v3.7-SNAPSHOT-968
2. add dynmap structures
3. start server

Expected behavior
the plugin loads

Screenshots
see log above

Desktop (please complete the following information):

• OS: Win 10 Enterprise LTSC 2022
• Java 21
• Paper 1.21.4
• dynmap v3.7-SNAPSHOT-968
• dynmap-structures v2.6.0 & v2.6.2

Additional context
Add any other context about the problem here.