Question Physics2D.OverlapAreaAll only works when using editor

I have a dungeon random generator that take predesigned rooms from a pool and connect thems. The rooms are prefabs with their own tilemaps, tilemap collider and environmental objects as their child gameObject.
I have a script for the room prefabs with a function (lets call it function A) that check through each tile in the room, run a OverlapAreaAll to see if there’s any collider there, and if there arent, the position is saved in a list as a spawnable point for enemies.

Here lies the problem. I’ve setup a Editor button so that I can manually run function A for each room to test if the function works, and it does. But when I loop through the all the rooms from the roomsManager gameObject and run function A for each, OverlapAreaAll can’t seem to detect any collider.

Does anyone has an idea on what might be going on? Any idea would help as I can’t seem to find anyone with the same problem

 

Update:
It would seems the problem isn't with OverlapAreaAll, but with when it's ran after Instantiating the room prefabs. When I add an IEnumerator to wait for 1 second before running OverlapAreaAll, it can detect the colliders in the child objects of the room just fine. I'm not sure if that's how it's supposed to be though or there's something wrong

 

I see, thanks a lot for your input. I’ll check it and comeback to you if there’s anything