In FA23, P659 the Placenta previa is defined as " Over internal crevical os" HOWEVER the placenta that is located less that 2 cm from the internal cervical os and not covering it , is defined as Low-lying Placenta.
And AMBOSS Explains these changes in the terms :
https://next.amboss.com/us/article/UO0b7T?q=low-lying+placenta#Z1db2139696fe3faeb94bf4f4b9a5ac16:~:text=Previously%2C%20this%20category%20included%20marginal%20previa%20(placenta%20reaching%20the%20internal%20os)%2C%20partial%20previa%20(placenta%20partially%20covering%20the%20internal%20os)%2C%20and%20complete%20previa%20(placenta%20completely%20covering%20the%20internal%20os)%3B%20these%20terms%20have%20been%20excluded%20from%20the%20new%20classification.