Bounce to Source naming

Just getting back to Ardour ahead of teaching and it seems that since I last used it a couple of months back, Bounce Range to Source List has a new feature. It adds the track name at the end of the name I give to the bounced file (e.g. ‘kick1’ becomes ‘kick1-Audio 1’). Did I do something to switch this feature on? How do I stop it adding to the name? I looked in Preferences but couldn’t see this listed. It’s not necessary for me and is a visual distraction in the Source list and in the Edit window. Thanks.