Plugin fails to load on 1.21.3

[ArZorMC]

[21:50:39 ERROR]: Error occurred while enabling Panilla v1.12.3 (Is it up to date?)
java.lang.StringIndexOutOfBoundsException: Range [23, 22) out of bounds for length 22
at java.base/jdk.internal.util.Preconditions$1.apply(Preconditions.java:55) ~[?:?]
at java.base/jdk.internal.util.Preconditions$1.apply(Preconditions.java:52) ~[?:?]
at java.base/jdk.internal.util.Preconditions$4.apply(Preconditions.java:213) ~[?:?]
at java.base/jdk.internal.util.Preconditions$4.apply(Preconditions.java:210) ~[?:?]
at java.base/jdk.internal.util.Preconditions.outOfBounds(Preconditions.java:98) ~[?:?]
at java.base/jdk.internal.util.Preconditions.outOfBoundsCheckFromToIndex(Preconditions.java:112) ~[?:?]
at java.base/jdk.internal.util.Preconditions.checkFromToIndex(Preconditions.java:349) ~[?:?]
at java.base/java.lang.String.checkBoundsBeginEnd(String.java:4865) ~[?:?]
at java.base/java.lang.String.substring(String.java:2834) ~[?:?]
at java.base/java.lang.String.substring(String.java:2807) ~[?:?]
at Panilla.jar/com.ruinscraft.panilla.bukkit.PanillaPlugin.initVersion(PanillaPlugin.java:188) ~[Panilla.jar:?]
at Panilla.jar/com.ruinscraft.panilla.bukkit.PanillaPlugin.onEnable(PanillaPlugin.java:133) ~[Panilla.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:1.21.3-68-cb2ab7d]
at io.papermc.paper.plugin.manager.PaperPluginManagerImpl.enablePlugin(PaperPluginManagerImpl.java:109) ~[paper-1.21.3.jar:1.21.3-68-cb2ab7d]
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:655) ~[paper-1.21.3.jar:1.21.3-68-cb2ab7d]
at org.bukkit.craftbukkit.CraftServer.enablePlugins(CraftServer.java:604) ~[paper-1.21.3.jar:1.21.3-68-cb2ab7d]
at net.minecraft.server.MinecraftServer.loadWorld0(MinecraftServer.java:768) ~[paper-1.21.3.jar:1.21.3-68-cb2ab7d]
at net.minecraft.server.MinecraftServer.loadLevel(MinecraftServer.java:530) ~[paper-1.21.3.jar:1.21.3-68-cb2ab7d]
at net.minecraft.server.dedicated.DedicatedServer.initServer(DedicatedServer.java:326) ~[paper-1.21.3.jar:1.21.3-68-cb2ab7d]
at net.minecraft.server.MinecraftServer.runServer(MinecraftServer.java:1234) ~[paper-1.21.3.jar:1.21.3-68-cb2ab7d]
at net.minecraft.server.MinecraftServer.lambda$spin$0(MinecraftServer.java:340) ~[paper-1.21.3.jar:1.21.3-68-cb2ab7d]
at java.base/java.lang.Thread.run(Thread.java:1583) ~[?:?]
[21:50:39 INFO]: [Panilla] Disabling Panilla v1.12.3

[mrfloris]

same for 1.21.4, and with 1.21.5 around the corner, .. i fear the worst. It's inactiveResource on spigot, .. kinda worry this one is going away