Subdial (minutes) on Chrono keeps running but Chrono not engaged? Is this an issue?

[messikens]

Hi all,


Recently got a 43mm ROO but noticed one thing and wasn't sure if this warrants getting it checked out.
I noticed the minute subdial of the Chrono (i.e. the 9 o'clock sub-dial) keeps running even though the Chronograph itself (i.e. the seconds hand) is not engaged at all for any amount of time.

If I do a flyback it resets to zero but I am confused as to why it would just keep running.

Can someone tell me if this is expected? I couldn't really find anything online but I am doubtful it works as it should... just want to check before I head to the boutique.


Thanks