Fix boss bars not showing up on dimension switch

core/src/main/java/org/geysermc/geyser/session/cache/EntityCache.java

@@ -155,6 +155,14 @@ public class EntityCache {
         }
     }
 
+    /**
+     * Re-adds all boss bars to the client by re-creating the entities attached to them.
+     * This seems to fix boss bars showing up on dimension switch, as of Bedrock 1.19.81.
+     */
+    public void addBossBars() {
+        bossBars.values().forEach(BossBar::addBossBar);
+    }
+
     public void updateBossBars() {
         bossBars.values().forEach(BossBar::updateBossBar);
     }

core/src/main/java/org/geysermc/geyser/translator/protocol/bedrock/entity/player/BedrockActionTranslator.java

@@ -238,7 +238,7 @@ public class BedrockActionTranslator extends PacketTranslator<PlayerActionPacket
                 attributesPacket.getAttributes().addAll(entity.getAttributes().values());
                 session.sendUpstreamPacket(attributesPacket);
 
-                session.getEntityCache().updateBossBars();
+                session.getEntityCache().addBossBars();
                 break;
             case JUMP:
                 entity.setOnGround(false); // Increase block break time while jumping