Alarm muted when using 'side keys behaviour' - can somebody test (quick test!)

Hi I was wondering if I was alone on this but ever since the new update, my alarm would not sound (but screen turns on) if the alarm is using either the Snooze or Dismiss 'Side keys behaviour'. The alarm does sound when the side keys behaviour is set to none though! I've tried both using mp3 files and the default ringtones.

Extra details:
I found that using default ringtones will make the alarm sound BUT for only half a second and never again.
Phone is not on silent mode and alarm volume is up.
Phone is up to date, tried restarting but no differences

Thanks for reading!.