There are many instances where Polish official building information shows two buildings as separate, but the OSM community has decided to merge them as sharing a wall.

On GSV, you can see that the masonry of the building to the north clearly joins to the building to the south. So, the buildings can be partially connected. Please leave this note open until I can return to this location and further investigate.

Also, a request: please do not resolve any of my notes until 48 hours have passed since I left them. I typically map with Vespucci and leave notes for myself that I can resolve the next day with JOSM. Sometimes there are details that only I remember, they cannot be concisely expressed in a note, so it can be a problem if someone non-local maps there and resolves the note in the intervening hours.