i can never make sense of text or scripting stuff since im a visual mapper haha
but seems to me that you have a node without volumes + leak so possibly forgotten to seal off the skybox entirely, it can accidentally happen if you for instance select the skybox or caulk brush containing the entire level, that is why there is a select skybox on/off toggle to never accidently move them around if you lets say hold in shift and select a bunch of trees + 1 little brush (not consciously) ofc.
You can also go to each reference point
1216.31 0.00 448.00 in radiant with
ALT+M+G or by pressing Misc then go to position... in the menu.