"Find optimal master" defaults to the first date

In Radar \ Coregistration \ Automatic coregistration , on “Create stack” separator, after selecting “Find Optimal Master” and seeing that the middle date is selected, after executing “Run” the Optimal master defaults to the first date.

I’m using three SLC IW products subsets, same ascending pass and swath but different dates.
SNAP version v2.0 beta 7, Linux64.

I also noticed that in “create stack” the ‘Minimum’ option is not working properly and the extension is always equal to the first image… This was working properly in the previous version…