Cancel mannequin data from unknown entities

Author: kennytv

common/src/main/java/com/viaversion/viabackwards/protocol/v1_21_9to1_21_7/rewriter/EntityPacketRewriter1_21_9.java

@@ -244,8 +244,10 @@ protected void registerRewrites() {
  return;
  }
  if (id == VersionedTypes.V1_21_9.entityDataTypes.mannequinProfileType.typeId()) {
- // Handled separately
- return;
+ if (event.entityType() == null) {
+ event.cancel();
+ }
+ return; // Handled separately
  }
  if (id > VersionedTypes.V1_21_9.entityDataTypes.armadilloState.typeId()) {
  id -= 2;