AI don't move on certain terrain

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Creative

What Type of Bug are you experiencing?

Assets

Summary

in my map if i spawn an AI, it won’t be able to move. does anyone know how to fix this issue?

Steps to Reproduce

i tried to generate AI in a map where there is a giant cylynder which covers the entire map which it’s used for custom skybox, and of course it has no collision. when i spawned zombies they would only attack on loop

Expected Result

when spawned, ai will be stuck on place

Observed Result

AI would be stuck on place

Platform(s)

the only platform i tried was on PC, so i don’t know in other platforms