See the lower structures in this video (space between belts and chest+pipe):
I think this is connected to 129585 (upper structure - building over the chest). but there it was reported Off-Topic, this should be not included in that bug - hence opening a new bug report here.
[2.0.62] No entry or exit automatic underground belt when building over empty space
Re: [2.0.62] No entry or exit automatic underground belt when building over empty space
As of 2.0.73 this is still an issue and quite annoying when transport lines (belts) get erroneously connected where they shouldn't, causing unexpected item mixing.
It's not clear to me whether this issue is tracked anywhere as an open bug.
It's not clear to me whether this issue is tracked anywhere as an open bug.
Re: [2.0.62] No entry or exit automatic underground belt when building over empty space
The one without gap is the one you linked, the one with gap is 128718.

