Thin copper pipe next to the fireplace cut, house from the 60s

Hello, I have rented a house from the 60s and am currently making a breakthrough between the kitchen, where the chimney is in the corner, and the living room. The lintel is located just before the fireplace in the wall (living room wall = the same wall that the fireplace is on). While working it out, I accidentally cut through a non-insulated copper pipe about 8-10 mm in outer diameter and about 3 mm inner diameter, running from the ceiling evidently down past the floor into the basement, about 2 cm next to the fireplace in the wall. Now my question is, does this have anything to do with the fireplace, do I need to worry about this concerning the oil heating, or what could it have been used for? I cannot assign where it comes from and where it goes. Everything works as before. Thank you in advance for the collective knowledge.

Hello,

check if there was an oil stove in the room. These were previously supplied with oil through these thin pipes. However, they should then lead to the attic, at least that was the case for me.

Regards

Please upload a picture, then it will be easier to judge.