Lines when first layers have indentations

Hi all.

Recently printed a hueforge clock face with cutouts for the numbers and also printing a foldable basket just now which also has cutouts. On both I am noticing that whilst the first few layers look basically fine, I am getting artifacts in line with some of the indentations. Difficult to describe but hopefully what I am talking about is visible in the following pic. Using Bambu Basic red in this case. Would anyone know the reason for this sort of thing and any resolution?

Thanks

That really looks as if the filament needs a proper calibration.
Those lines might not go away fully but they should be near invisible.
It is not a first layer defect or some random build up.