Geometry Brush Actors not updating correctly

What am I doing wrong?

It happens very often that when I use geometry in subtractive mode and / or change the brush sizes, the collision doesn’t get updated while the render does, like here:

When this happened, I could even resize the ground to like 100² and I could still walk across the previous 15000². In the end I had to delete the ground completely and redo it to get the size working correctly and get subtractive geometry to work again, but any subtractives that were previously built just don’t work anymore like here:

298099-untitled2.png

Also simple resizes can sometimes cause major collision problems, like if you have a tower and make it smaller, the collision doesn’t update and you are standing mid-air.

These are supposed to reduce the time it takes to outline a level, but if they are this instable, it just costs me much more than using 1M blocks and scaling them.

Are there any tips on how these can be safely used?

Ok the second one is definitely order related, so that should not be a problem then.

The problem with the collision not updating is something different though!