Yes, in cycles it works correctly but in EEVEE it's do nothing.
Apr 23 2019
Jan 15 2019
Nov 12 2018
Nov 8 2018
Mar 2 2018
Apr 17 2015
Our team planned to implement this feature if it will be supported.
It's not convenient if you need in the process of creating the second group of seams compare them with the first group. When you use a vertex group in this way you may receve unwanted result like in the picture