ticket last updated date is modified when network admin just read it

Hi,

I would like to mention a fact that I noticed some time ago and that is still present in the plugin last version I intensively use (2.1.9.1) on my wp network to communicate with the subsite admins.

Each time I just read one ticket as network admin, the 'last updated date' field is updated to the current time.

It is really annoying because tickets are by default sorted by 'last updated date'.

Could this be fixed on a future release ?

Thanks