Navigation for ai doesn't work on certain levels(4.27)

Development Programming & Scripting Blueprint
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1

Hi, I was building a stealth game with an ai, when for seemingly no reason, the ai stopped working, including the chase mechanics. It seems pawn sensing still works, but the nav mesh does not. It still works on different levels, but I’d prefer not to have to rebuild my map

List of solutions I have tried
-restarting the engine
-replacing the nav mesh
-Splitting up the nav mesh

Please answer as soon as possiable

2

I forgot to add this, but I have also tried rebuilding the navigation

3

So I found a somewhat working fix, it turns out for some weird reason, deleting this boat I made fixes everything, I’m ok with that, but I’m worried that if I add another structure, it will stop working again