Navigation Mesh for the Pathfinding Service isn't loading some areas on runtime

Hello, the Pathfinding service wasn’t finding the correct path for my game then I turned the navigation mesh. Everything looked fine on the edit mode but when I wanted to playtest the navigation mesh changed in some regions without any part changes. I checked in the game it wasn’t finding the accurate path in the game as well.

It happens both in Studio and the Player. There is a link for the place if you can check it without access Defenders - Roblox.

It happens only when playtesting or in-game but everything seems normal on the edit mode in the studio.

I think some chunks are missing because the non-loading regions are square.

The place use terrain which is generated from Terrain Region (not by a script that loads it on each startup, I copied from a place using command bar). Pathfinding service is used more than a hundred times tried with a cooldown after instance startup didn’t change anything.