Right above the lamp is where its 'interactionbox' ends. Character will examine the building behind this building. This will not be an issue if there is no building behind said building, in which you can enter by clicking the tip of the tower. Only on angles like these.
Probably not only for Tinkerers Tower, but that is the building I noticed this on.
Also kind of gameplay thing. I tried entering the tower before nightfall, but Willow kept examining the watch tower and I didn't notice untill it was too late.
Examine Tinkerers Tower above the lamp when theres a watch tower behind it (probably works for other buildings as well)