Make bossbar patch a configurable option

src/main/java/us/myles/ViaVersion/ViaVersionPlugin.java

@@ -236,6 +236,10 @@ public class ViaVersionPlugin extends JavaPlugin implements ViaVersionAPI {
         return getConfig().getBoolean("hologram-patch", false);
     }
 
+    public boolean isBossbarPatch() {
+        return getConfig().getBoolean("bossbar-patch", true);
+    }
+
     public double getHologramYOffset() {
         return getConfig().getDouble("hologram-y", -1D);
     }

src/main/java/us/myles/ViaVersion/transformers/OutgoingTransformer.java

@@ -896,8 +896,8 @@ public class OutgoingTransformer {
             }
         }
 
-        // TODO: Add config option
         // Boss bar
+        if(plugin.isBossbarPatch()) {
             if (type == EntityType.ENDER_DRAGON || type == EntityType.WITHER) {
                 if (entry.getOldID() == 2) {
                     BossBar bar = bossBarMap.get(entityID);
@@ -929,6 +929,7 @@ public class OutgoingTransformer {
                 }
             }
         }
+    }
 
 
     private UUID getUUID(int id) {

src/main/resources/config.yml

@@ -19,3 +19,5 @@ hologram-patch: false
 hologram-y: -1
 # Enable player tick simulation, this fixes eating, drinking, nether portals.
 simulate-pt: true
+# Should we patch boss bars so they work? (Default: true, disable if you're having issues)
+bossbar-patch: true