I had one leak after about a year, I hadn’t pushed it in far enough and the cut was rough too. I noticed it as a drip under the stairs and had to cut a hole in the hallway wall
Did you use an axe to cut the pipe?
Tip for anyone reading this is the double flipped K symbols if you cut it on one, the next one should be only just visible. If you need to cut it not on the mark, just make a fresh mark.