The complaints about the quality and behavior of the Bambu branded PETG are numerous here and on other venues like reddit. I am not alone in my opinions.
I print a lot of PETG, and have been successfully printing it for the year and a half I have had my X1C. Other brands like Sunlu print perfect with no fuss. Bambu PETG, even after being dried well, does not print cleanly with their provided profile resulting in a lot of stringing, blobbing, and under extrusion - the flow rate is way to high. It is so bad I am shocked Bambu released the profile as it is. Dropping down flow rate or specifying the generic profile helps a lot, but side by side Sunlu prints noticable better still.