AI Move To will always return failure,If the Pawn’s CapsuleComponent is too small

I’m a new one in UE development. I’m using the Windows version of UE5.5. The AI behavior is driven by StateTree, and I’m using StateTreeAIComponent.

Here’s the situation: in my game, I’m using AI Move To to let the AI approach a target.

I encountered a very strange issue. Below is my core Blueprint logic.When AI Move To succeeds, it prints “1”. If it fails, it prints “2”.

First, I set the AI Actor’s Capsule radius and height to be very small.

You can see that when the game runs, the AI overlaps with the target, but it still reports failure. The printed result confirms this.

Next, I increased the Capsule radius and height of the AI Actor, as shown below.

After running the game again, the result is as follows.

I really donn’t know what’s happened there, why the capsule size will cause this result.
could anyone tell me what’s happend?