A while ago I bought a roll of transparent petg “the filament” by spectrum. Wonderful, it printed great, shiny, smooth. I loved it.
Then I took advantage of the promotion on the Bambu lab website “4 rolls are discounted + free shipping” and I bought their transparent petg.
I opened the vacuum bag, loaded immediately in the printer and it strings and pops. Settings are correct as the slicer has a dedicated profile for this roll.
Their website says “warning: dry before using” - they mean that it comes already too moist from the factory?
Print speed shouldn’t really change anything when the filament is saturated with moisture. You might see more severe effects with faster printing but printing slowly with wet filament would still yield some pretty bad results. As stated in another comment, filament hygroscopy varies by brand so maybe you lucked out!