It's known, and it's not a bug. Mostly.

In order for the connection to be visible, the companies must be connected by road. In these examples, companies are not connected by roads. What you can see is the roadside painted with asphalt material. To create a connection, we would have to either rebuild each such place and connect them physically with roads, or make a connection with a special tool, which with such small distances doesn't make complete sense. In addition, connections made with this tool don't support GPS navigation (red path/green arrows), therefore in case of small gaps between road and companies/stations, it is not considered a bug by us, and will not be "fixed". As for bigger gaps. Feel free to report such place, because it makes more sense to fix them, than this smaller ones.