The cracks may be variety specific. Venus is descended from Zill IndoChinese (ZIC/ZINC) so like it’s parent, it can have superficial cracks. Sweet Tart and Kathy, both also descendants of ZINC, can also have superficial cracks.
These cracks often occur on fruit I’ve grown in SoCal and the cracks often have sap beads seeping out of them. I’ve tasted some of the sap beads and they taste sweet.
Another negative trait of this lineage is the potential for uneven ripening. This can be avoided by picking the fruit before it becomes fully tree ripened.
Zill Indochinese, Kathy (K3), Venus and Sweet Tart are all so delicious that they are definitely worth planting if you have space for them. These mangos are all absolutely delicious!
Simon