Fix Spigot 1.21.10+ ReflServerStateProvider (EssentialsX#6377)

Author: Stackulate

providers/NMSReflectionProvider/src/main/java/net/ess3/nms/refl/ReflUtil.java

@@ -23,6 +23,8 @@ public final class ReflUtil {
     public static final NMSVersion V1_19_R1 = NMSVersion.fromString("v1_19_R1");
     public static final NMSVersion V1_19_R2 = NMSVersion.fromString("v1_19_R2");
     public static final NMSVersion V1_20_R4 = NMSVersion.fromString("v1_20_R4");
+    public static final NMSVersion V1_21_R6 = NMSVersion.fromString("v1_21_R6");
+    public static final NMSVersion V1_21_R7 = NMSVersion.fromString("v1_21_R7");
     private static final Map<String, Class<?>> classCache = new HashMap<>();
     private static final Table<Class<?>, String, Method> methodCache = HashBasedTable.create();
     private static final Table<Class<?>, MethodParams, Method> methodParamCache = HashBasedTable.create();

providers/NMSReflectionProvider/src/main/java/net/ess3/nms/refl/providers/ReflServerStateProvider.java

@@ -18,7 +18,11 @@ public ReflServerStateProvider() {
         MethodHandle isRunning = null;
 
         final String MDFIVEMAGICLETTER;
-        if (ReflUtil.getNmsVersionObject().isHigherThanOrEqualTo(ReflUtil.V1_20_R4)) {
+        if (ReflUtil.getNmsVersionObject().isHigherThanOrEqualTo(ReflUtil.V1_21_R7)) {
+            MDFIVEMAGICLETTER = "z";
+        } else if (ReflUtil.getNmsVersionObject().isHigherThanOrEqualTo(ReflUtil.V1_21_R6)) {
+            MDFIVEMAGICLETTER = "B";
+        } else if (ReflUtil.getNmsVersionObject().isHigherThanOrEqualTo(ReflUtil.V1_20_R4)) {
             MDFIVEMAGICLETTER = "x";
         } else if (ReflUtil.getNmsVersionObject().isHigherThanOrEqualTo(ReflUtil.V1_19_R2)) {
             MDFIVEMAGICLETTER = "v";