When using both ReceiveTickAI and ReceiveSearchAI nodes, ReceiveTickAI is called before ReceiveSearchAI. This was not the case in 4.18.
Results: ReceiveTickAI is called before the first tick
Expected: ReceiveSearchAI is called before the first tick.
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-56257 in the post.