powder snow is 1.17+

Bukkit/src/main/java/com/plotsquared/bukkit/listener/BlockEventListener.java

@@ -121,6 +121,23 @@ public class BlockEventListener implements Listener {
             Material.TURTLE_EGG,
             Material.TURTLE_SPAWN_EGG
     );
+    private static final Set<Material> SNOW;  // needed as Tag.SNOW isn't present in 1.16.5
+
+    static {
+        if (PlotSquared.platform().serverVersion()[1] < 17) {
+            SNOW = Set.of(
+                    Material.SNOW,
+                    Material.SNOW_BLOCK
+            );
+        } else {
+            SNOW = Set.of(
+                    Material.SNOW,
+                    Material.SNOW_BLOCK,
+                    Material.POWDER_SNOW // only since 1.17
+            );
+        }
+    }
+
     private final PlotAreaManager plotAreaManager;
     private final WorldEdit worldEdit;
 
@@ -529,7 +546,7 @@ public class BlockEventListener implements Listener {
             event.setCancelled(true);
             return;
         }
-        if (Tag.SNOW.isTagged(event.getNewState().getType())) {
+        if (SNOW.contains(event.getNewState().getType())) {
             if (!plot.getFlag(SnowFormFlag.class)) {
                 plot.debug("Snow could not form because snow-form = false");
                 event.setCancelled(true);
@@ -561,7 +578,7 @@ public class BlockEventListener implements Listener {
             return;
         }
         Class<? extends BooleanFlag<?>> flag;
-        if (Tag.SNOW.isTagged(event.getNewState().getType())) {
+        if (SNOW.contains(event.getNewState().getType())) {
             flag = SnowFormFlag.class;
         } else if (Tag.ICE.isTagged(event.getNewState().getType())) {
             flag = IceFormFlag.class;
@@ -678,7 +695,7 @@ public class BlockEventListener implements Listener {
             }
             return;
         }
-        if (Tag.SNOW.isTagged(blockType)) {
+        if (SNOW.contains(blockType)) {
             if (!plot.getFlag(SnowMeltFlag.class)) {
                 plot.debug("Snow could not melt because snow-melt = false");
                 event.setCancelled(true);

Core/src/main/java/com/plotsquared/core/command/Grant.java

@@ -32,6 +32,7 @@ import com.plotsquared.core.util.TabCompletions;
 import com.plotsquared.core.util.task.RunnableVal;
 import com.plotsquared.core.util.task.RunnableVal2;
 import com.plotsquared.core.util.task.RunnableVal3;
+import com.plotsquared.core.uuid.UUIDMapping;
 import net.kyori.adventure.text.minimessage.Template;
 
 import java.util.Collection;
@@ -39,7 +40,6 @@ import java.util.Collections;
 import java.util.LinkedList;
 import java.util.List;
 import java.util.Map;
-import java.util.UUID;
 import java.util.concurrent.CompletableFuture;
 import java.util.concurrent.TimeoutException;
 import java.util.stream.Collectors;
@@ -88,8 +88,8 @@ public class Grant extends Command {
                                 Template.of("value", String.valueOf(uuids))
                         );
                     } else {
-                        final UUID uuid = uuids.iterator().next();
-                        PlotPlayer<?> pp = PlotSquared.platform().playerManager().getPlayerIfExists(uuid);
+                        final UUIDMapping uuid = uuids.toArray(new UUIDMapping[0])[0];
+                        PlotPlayer<?> pp = PlotSquared.platform().playerManager().getPlayerIfExists(uuid.getUuid());
                         if (pp != null) {
                             try (final MetaDataAccess<Integer> access = pp.accessPersistentMetaData(
                                     PlayerMetaDataKeys.PERSISTENT_GRANTED_PLOTS)) {
@@ -103,7 +103,7 @@ public class Grant extends Command {
                                 }
                             }
                         } else {
-                            DBFunc.getPersistentMeta(uuid, new RunnableVal<>() {
+                            DBFunc.getPersistentMeta(uuid.getUuid(), new RunnableVal<>() {
                                 @Override
                                 public void run(Map<String, byte[]> value) {
                                     final byte[] array = value.get("grantedPlots");
@@ -128,7 +128,7 @@ public class Grant extends Command {
                                         boolean replace = array != null;
                                         String key = "grantedPlots";
                                         byte[] rawData = Ints.toByteArray(amount);
-                                        DBFunc.addPersistentMeta(uuid, key, rawData, replace);
+                                        DBFunc.addPersistentMeta(uuid.getUuid(), key, rawData, replace);
                                         player.sendMessage(
                                                 TranslatableCaption.of("grants.added"),
                                                 Template.of("grants", String.valueOf(amount))