VM 2.0.x - 2.0.12: I create a new product, add title, apply 19% VatTax rule, enter final price 10 €, check 'Calculate the costprice' and save: the resulting cost price is 10 € (wrong) and the final price is then 11.9 € (wrong). If I enter again final price 10 €, check 'Calculate the costprice' and save: Now the cost price is 8.40336 € (correct) and final price remains 10 € (correct).

Am I doing wrong or is the calculation buggy?