UE5.4 NavmeshRecast crash on package build

Hi!

I stumble upon a memory problem regarding the NavmeshRecast.

Somehow, whenever I load a level, there will be a memory allocation of ~4GBs for NavmeshRecast (got this from LLM). It only occurs on the first 3-5mins after loading the level (it just gone after that).
However, this leads to a problem on the mid-end device because whenever the game load to another level there will always be a spike of memory usage, which cause crash OutOfMemory.

Any suggestion where I should begin to optimize?

Thx