In the case we're doing a copy entity disguise, try avoid failing a copy. Doesn't fix the underlying issue I believe.

plugin/src/main/java/me/libraryaddict/disguise/disguisetypes/FlagWatcher.java

@@ -1022,8 +1022,12 @@ public class FlagWatcher {
 
     @Deprecated
     public <Y> void setUnsafeData(MetaIndex<Y> id, Y value) {
+        if (!id.getDefault().getClass().isInstance(value)) {
+            setBackupValue(id, value);
+        } else {
             setData(id, value);
         }
+    }
 
     protected <Y> void setData(MetaIndex<Y> id, Y value) {
         if (id == null) {