I have this often and its mostly when you moo things
and try to place gate anywhere in the build... sometimes even doors
but game somehow considers everywhere gate touched as stuff that should disappear out of gates way
and workaround that ive found is that when the fence disappears after placing gate
you have to drag another gate over the spots where fence is invisible for it to show again
and try to avoid gate snapping to any spot of fence that is visible (cause it will make new invisible fence spots to fix)
and delete the extra gate after you have all of the fence showing again
(do not place it down cause that again creates new spot to fix)
