You should have posted that first screenshot in the first place! 
I thought there would be some special symbol, but it was just a space. Now i'm able to reproduce this. 3.9.1 works fine. So you can either go back to 3.9.1 for a while or replace the URL in the addressbar when needed (change https://server:9091/group-edit.jsp?group=Lojas%2BJPLR
to https://server:9091/group-edit.jsp?group=Lojas%20JPLR
and this will work. And you can also do not use spaces in the names for now (or at all, a good practice after all) Filed as OF-782. Hopefully it will be fixed for the next release.