Subdivision Surface Modifier partly closes holes I am trying to recreate a wireless phone charger. And the hole for the USB-C input will partly close itself when adding the subdivision surface modifier.
The hole is created using the knife tool on a sphere. And then modeled by copying the vertices with  E

When deleting the faces beside the hole, the problem is gone. But that is not a solution.

I have spend hours trying to fix this but I can't find a solution for this.
Subdivision Surface will virtually move your edges and create intermediate ones in order to smooth the whole shape. The part you show is only made of one big face with a hole in its center. In its try to smooth it, some vertices will be created in the hole area, which will give bad result. Here is what it gives with a simplified version (without and with the modifier):

If you cut your face the thing won't happen any more:

In your case you could fix it with this kind of topology: