JabRef version:
JabRef 4.0.0-dev--snapshot--2017-05-07--master--4832e5d86
Windows 7 6.1 amd64
Java 1.8.0_92
With all options reset to default values.

Steps to reproduce:

1. Open the below BibLaTeX file.
2. Sort by the entry column "author".
3. Problem: item:2, with the name entered as "José María {Rodriguez Fernandez}" is apparently sorted in under F instead of under R (as item:1).

Comment:
I have not yet received confirmation whether the above format of the name of item:2 is supposed to be a valid alternative for "Rodriguez Fernandez, José María", but it used to work correctly in earlier versions (both for displaying the names in the author/editor column and for sorting them) and, since #2652 has been resolved, it again works correctly in displaying the name in the author/editor column in the current developer version.

BibLaTeX file:
% Encoding: UTF-8

@Article{Item:1,
author = {Rodriguez Fernandez, José María},
title = {L'arc du ciel},
date = {2016},
}

@Article{Item:2,
author = {José María {Rodriguez Fernandez}},
title = {L'arc du ciel},
date = {2016},
}

@Article{Item:3,
author = {José Martinez},
title = {Jabref's Issues},
date = {2017},
}

@comment{jabref-meta: databaseType:biblatex;}