Just tested this out in spvp with a thief using Sleight of Hand and Basilisk Venom, and it seems that a target which is afflicted with both a stun and daze can still use stun breakers but are still stunned afterwards. For example, popping Mist form during the stun and daze but still unable to move.
Also, daze allows you to use all instant cast utility skills, which applies to all stun breaker. Daze currently only affects all weapon skills and all utilities with a cast time. Not sure if this was a bug, but to my understanding of daze I thought you weren’t supposed to be able to cast any skills at all. So a stun and daze combo should have prevented a target from stun breaking.
Not sure if this is actually two bugs.