As the title says, I’ve got a P1S / AMS 2 Pro combo and whenever I print parts at around 6-7mm off the print bed, print quality goes down the drain and then returns back to normal (or relatively normal after parts partially spaghettify) after passing 1 cm of height. Nozzle is 0.4 with 0.2mm layer height for the 2nd and 4th photo, 0.08mm for everything else.
In the pictures I’ve shown, I had already done flow calibrations for each time, used different 0.4mm nozzles incase one of them was a lemon, dried my filament, leveled the print bed, checked belt tension, and did all manner of vibration calibrations accessible in the Bambu Slicer. Last photo is a 5mm thick plate that printed just fine just below the problem height.
Printer has the top lid open for PLA and there are no external or internal modifications of any kind save for the small aluminum tape on the poop chute to prevent jams.