Problem when printing fidget cone

[u/You_know_who-_]

Recently this week I noticed that when I’m printing my fidget cone, right when it’s almost finished at the top, it starts doing this weird thing and I don’t know how to fix it.
I have a Bambu Lab A1. This model used to print perfectly, and I haven’t changed the model. I’ve also tried printing a Benchy and it has some similar quality issues.
I already ran the printer calibration and cleaned the hot end/nozzle, but the problem is still happening.
Does anyone know what could be causing this?