Octavia's resonator will follow her into the next zone of ESO much like kavats/kubros do, the issue is that it can also bring along mallet (it might even still have some damage stored from the last zone)
Before jumping through the conduit
deploy a fresh resonator and mallet
make sure resonator collects mallet
jump through conduit
the reason I think this might be unintended is: its one of the only dps abilities that I know of that can be set up prior to entering the conduit in ESO (since the conduit acts like a nullifier in most situations). Sure, companions can be built to do good damage, but they don't CC and do AOE damage. During reproduction to ensure it was consistent I was able to get ~40 seconds of resonator and mallet from the previous zone, if this is combined with a focus lens it makes octavia almost plain better than many other ESO "meta" frames in terms of focus farming since you can drag a charged mallet from zone to zone and not have to worry about the zone start penalty that most other DPS frames do.
I would love this to be an intended mechanic, but I felt it warranted a report just in case it is not