Community for the open source survival game VoxeLibre (formerly known as MineClone2). An open source project inspired by a very popular block game ;).
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Both regular pillagers and pillager captains can continuously spawn around the structure. Pillagers can still spawn if a player is inside the tower. In Java Edition, they spawn in a 72×54×72 area centered on the top level of the watchtower, the same level as the chest.
It's like witches, wither skellies, etc. The structure is just an indicator of an invisible box in which those special mobs spawn. This is how peóple make farms of them.
Im not sure how that works. Is it the structure or simply the place. Meaby they are spawning in that place no metter if you destroy structure or not. It would be interesting experiment to see, but meaby its easier to simply get answer from someone that knows the source code of the game. And also since its open source i understand that anyone could teoreticly search for that part in the code and figure out how spawning works.
But if you want to stop them there is one thing that comes to mind. Mobs cant spawn on slabs or carpet, basicly anything that is not full block.. So if you showel the grass they also wont be able to spawn on that. I would just place slabs around it. You can make it look nice if you want.
So i gues ten blocks in any direction of the tower would be enough, meaby more, idk. But thats what i would do.