The EntityPositionTracker now returns copies of its values to prevent them from being changed

src/main/java/eu/crushedpixel/replaymod/holders/AdvancedPosition.java

@@ -71,6 +71,10 @@ public class AdvancedPosition extends Position {
         this.roll = toApply.getRoll();
     }
 
+    public AdvancedPosition copy() {
+        return new AdvancedPosition(x, y, z, pitch, yaw, roll);
+    }
+
     @Override
     public AdvancedPosition newInstance() {
         return new AdvancedPosition();

src/main/java/eu/crushedpixel/replaymod/preparation/EntityPositionTracker.java

@@ -109,7 +109,7 @@ public class EntityPositionTracker {
         for(Pair<Integer, AdvancedPosition> pair : positions) {
             if(pair.getKey() <= timestamp) exists = true;
             if(pair.getKey() >= timestamp) {
-                if(exists) return pair.getValue();
+                if(exists) return pair.getValue().copy();
                 return null;
             }
         }