There are towers at the back of each spawn on Port Niles that a sapper can get into the upper chamber of by using the bomb to put in on the ledge and thus be able to jump into the window.
Just today 1/4/2021 at about 11:15 AM CST, the admin put out a message to the whole server saying "get out of the tower".
Here's an idea, REDESIGN THE MAP SO THAT YOU CAN'T ENTER THAT WINDOW.
We all know this can be done as a matter of fact thanks to the Holdfast Map Maker SDK, use the invisible player barrier wall to block players from going there.
It is NOT an exploit to use the sapper to place the bomb on the ledge because that's how putting a bomb down works, it places down right below you making you stand on top of it, and you can move it and place it down anywhere and still jump on it so nothing about that is exploitative.
If you want people to not be able to go up there, MAKE IT SO THEY CAN'T, it is YOUR map design thus it is YOUR FAULT that people are able to do that.
It is WRONG to try and punish players for doing what you ALLOW THEM TO DO in the game.
Either change the map or stop penalizing players for doing what the game allows them to do, this is just nonsense because the problem stems from YOU AGS and YOUR MAP design.