While I do not have the exact scientific answer for this I would this as long as the anaerobic is wet it would be OK for a while.
Aerobic would have a better chance a survival on a moist bio ball in a wet dry than it would in a cannister perhaps. I have no proof of this but, just my thoughts.
I had a fluidized sand filter once and it goes anaorobic pretty darn FAST. I was dealing with water issues for quite a while just from a 17 minute power outtage.