xtrabackup_binlog_info recording only GTID and not log pos anymore


We’re using Percona’s innobackupex version v1.5.1-xtrabackup with xtrabackup version 2.2.8.

At some point the from restored backups contains only the GTID and not the binary log filename and position as it used to:

backups-01:/restore/full# cat xtrabackup_binlog_info 

This makes a lot harder to restore to a point in time using parameter to be a binary log position to begin replaying the SQL statements from there.

The only workaround that I found is to use to dump the initial binary log file and manually search for the next GTID, taking its starting log poisition.

Is this expected or should I fill a bug report? Is there a way to make the point-in-time recovery straightforward with only the starting GTID at hand?

Thanks in advance,