I put one bird into the map and then the FPS goes from 120 to 18 and get 95,000 errors in the log.
Blueprint Runtime Error: Accessed None trying to read property CallFunc_Array_Get_Item6 from function: ‘ExecuteUbergraph_BP_NPC_FlyingWalking_Bird_Base’ from node: Branch in graph: EventGraph in object: BP_NPC_FlyingWalking_Bird_Base with description: Accessed None trying to read property CallFunc_Array_Get_Item6