try using prusa slicer (does anyone really use cura through choice ?)- and it's most likely not moisture - never had any issues with that and pla.
I guess you'd need to have the filament somewhere really humid for some time, for that to be an issue.

Did you change the printing temperature between abs and pla ?
Printing pla at abs temps would cause the described problem.

Basically give us as much information as possible.

Just saying: 'this did not work - tell me why'.
Without supplying any details, does not help :-)