Fix all users sharing the same meta state

common/src/main/java/me/lucko/luckperms/common/caching/stacking/GenericMetaStack.java

@@ -25,6 +25,8 @@ package me.lucko.luckperms.common.caching.stacking;
 import lombok.Getter;
 import lombok.RequiredArgsConstructor;
 
+import me.lucko.luckperms.common.utils.ImmutableCollectors;
+
 import java.util.ArrayList;
 import java.util.List;
 
@@ -60,4 +62,14 @@ public class GenericMetaStack implements MetaStack {
 
         return sb.toString();
     }
+
+    @Override
+    public MetaStack copy() {
+        return new GenericMetaStack(
+                elements.stream().map(MetaStackElement::copy).collect(ImmutableCollectors.toImmutableList()),
+                startSpacer,
+                middleSpacer,
+                endSpacer
+        );
+    }
 }

common/src/main/java/me/lucko/luckperms/common/caching/stacking/MetaStack.java

@@ -30,6 +30,7 @@ public interface MetaStack {
 
     List<MetaStackElement> getElements();
     String toFormattedString();
+    MetaStack copy();
 
     default void accumulateToAll(LocalizedNode node) {
         getElements().forEach(m -> m.accumulateNode(node));

common/src/main/java/me/lucko/luckperms/common/caching/stacking/MetaStackElement.java

@@ -36,6 +36,8 @@ public interface MetaStackElement {
 
     boolean accumulateNode(LocalizedNode node);
 
+    MetaStackElement copy();
+
     /**
      * Returns true if the types do not match
      * @param expectingPrefix if the method is expecting a prefix

common/src/main/java/me/lucko/luckperms/common/caching/stacking/NoopMetaStack.java

@@ -37,4 +37,9 @@ public class NoopMetaStack implements MetaStack {
     public String toFormattedString() {
         return null;
     }
+
+    @Override
+    public MetaStack copy() {
+        return this;
+    }
 }

common/src/main/java/me/lucko/luckperms/common/caching/stacking/elements/HighestPriorityElement.java

@@ -65,4 +65,9 @@ public class HighestPriorityElement implements MetaStackElement {
         this.entry = entry;
         return true;
     }
+
+    @Override
+    public MetaStackElement copy() {
+        return new HighestPriorityElement(prefix);
+    }
 }

common/src/main/java/me/lucko/luckperms/common/caching/stacking/elements/HighestPriorityOwnElement.java

@@ -59,4 +59,9 @@ public class HighestPriorityOwnElement implements MetaStackElement {
         return true;
     }
 
+    @Override
+    public MetaStackElement copy() {
+        return new HighestPriorityOwnElement(prefix);
+    }
+
 }

common/src/main/java/me/lucko/luckperms/common/caching/stacking/elements/HighestPriorityTrackElement.java

@@ -62,4 +62,9 @@ public class HighestPriorityTrackElement implements MetaStackElement {
         this.entry = entry;
         return true;
     }
+
+    @Override
+    public MetaStackElement copy() {
+        return new HighestPriorityTrackElement(prefix, plugin, trackName);
+    }
 }

common/src/main/java/me/lucko/luckperms/common/caching/stacking/elements/LowestPriorityElement.java

@@ -65,4 +65,9 @@ public class LowestPriorityElement implements MetaStackElement {
         this.entry = entry;
         return true;
     }
+
+    @Override
+    public MetaStackElement copy() {
+        return new LowestPriorityElement(prefix);
+    }
 }

common/src/main/java/me/lucko/luckperms/common/caching/stacking/elements/LowestPriorityOwnElement.java

@@ -58,4 +58,9 @@ public class LowestPriorityOwnElement implements MetaStackElement {
         this.entry = entry;
         return true;
     }
+
+    @Override
+    public MetaStackElement copy() {
+        return new LowestPriorityOwnElement(prefix);
+    }
 }

common/src/main/java/me/lucko/luckperms/common/caching/stacking/elements/LowestPriorityTrackElement.java

@@ -62,4 +62,9 @@ public class LowestPriorityTrackElement implements MetaStackElement {
         this.entry = entry;
         return true;
     }
+
+    @Override
+    public MetaStackElement copy() {
+        return new LowestPriorityTrackElement(prefix, plugin, trackName);
+    }
 }

common/src/main/java/me/lucko/luckperms/common/core/model/PermissionHolder.java

@@ -468,8 +468,8 @@ public abstract class PermissionHolder {
     public MetaHolder accumulateMeta(MetaHolder holder, List<String> excludedGroups, ExtractedContexts contexts) {
         if (holder == null) {
             holder = new MetaHolder(
-                    plugin.getConfiguration().get(ConfigKeys.PREFIX_FORMATTING_OPTIONS),
-                    plugin.getConfiguration().get(ConfigKeys.SUFFIX_FORMATTING_OPTIONS)
+                    plugin.getConfiguration().get(ConfigKeys.PREFIX_FORMATTING_OPTIONS).copy(),
+                    plugin.getConfiguration().get(ConfigKeys.SUFFIX_FORMATTING_OPTIONS).copy()
             );
         }