Bar number positioning in 3.6(.2) when saving scores from older versions

I started with a file created in version 2.3.2. I imported the file to 3.6.2, accepted the new layout, editet and corrected some things and saved it. I set the style of bar-numbers as left-aligned, saved the file and closed it.
As I reopened it, all of the bar numbers weren't left-aligned any more but they were centered. I can set the bar numbers left-aligned and save the file as often as I want to, when I close the file and reopen it, the bar numbers are centered again.
Of course, this is a minor issue, but also minor issues don't get fixed if they are unknown.