TAN POINT MASKING,  is an atypical characteristic the Bergamascos should never have.

This characteristic is visible at an early age only, and the breeding of promotion of dogs with such characteristics is reckless and detrimental to the breed.
Pictures of puppies with incorrect color proves the impurity of the individual (most likely mix-breeding with german shepherds, rottweiler or other similar breeds):
Young puppies with markings other that solid black (including greyed black) or other than grey merle are to be considered of suspicious background. It is only at a very young age that one can verify the true color of the Bergamascos as the color changes when the coat grows.
Pictures below show puppies with incorrect marking for the breed:

Those puppies have typical markings found in other breeds that produce phaeomelanin (Brown, red or fawn pigment), something the Bergamascos do not produce, Bergamascos only produce Eumelanin ( Black or diluted black pigment). Bergamascos cannot be all over tan or merle with tan muzzle and paws or black with tan puzzle and paws as in these pictures.
The correct genetic sequence of the bergamasco color is as follow: As C D E g/G m/M S t

From genetic studies, Bergamascos are strictly AsAs (solid black, diluted or not by M-merle or G-graying).
As at the level of the agouti series (A locus), is all over dark, produces black without any tan on the dog.
In addition to that the Bergamascos are EE. E is the extension of the dark pigment, preventing masking and brindle in conjunction with A (extension series).

The puppies from the photos that have the tan at the top of the eyes and legs present signs of the locus at , not the normal As found typically in Bergamscos.
The locus at, present in double dose atat , produces a dog which is predominantly black, with tan markings on the muzzle, over the eyes, on the chest, legs, and under the tail (just like the puppies in the picture). A Dobermann or Rottweiler is a good example of the classic black and tan pattern. The Bernese Mountain Dog shows the effect of black and tan combined with white markings, often called tricolor (a breed popular in the Swiss Alps) are atat. If that dogs also has the merle gene, then the same tan markings will appear over a merle coat.

The locus at, the tan point gene (known as "traditional tan points") is almost the bottom recessive in the agouti series A (the only one below it is recessive black a, which is very rare). This means that, generally, a dog must have two copies of the tan point gene in order to express tan points, so their A locus genotype must be atat.
For the puppies in the picture to be that color ( black or merle with tan points), both the dam and the sire have the at gene in order to create atat (one at from each parent) , which will be very atypical for the Bergamasco breed to have those genes.
Or worse case scenario, the Dam has it and got bred by another dog than the thought Sire ( such as a German shepherd, Pincher or other who carries the at gene) and the puppies are mix breed.

Bottom line, those markings are a concern to anyone wanting to keep the line pure, none of these puppies should ever be bred. With a litter this far off as far as the colors are is concern, one should run a DNA test to confirm they don't have the correct genetic sequence of a bergamasco (As C D E g/G m/M S t ) or to make sure that the intended sire is the actual father, and not some random dog that got the dam pregnant. In any case it is a genetic proof that the parents are not 100% Bergamasco.

It is irresponsible for any breeder to breed suspicious specimen and to sell such puppies without a non breeding clause.
Such people do not realize the harm they can do by being so reckless, as the tan point marking might look like natural discoloration at an older age and those incorrect specimen might not look so unusual as full grown adults, while they are still carrying an un-pure ancestry.