I have had this happen in my long hive. In that situation I pushed the hive tool under the inner covers- and used it to pry/lever the frames away from the cover and break the bridge comb. The good news for you is that’s a sure indication that the bees are ready for a super.
G’day Jack,
YEP, your dead right. The very same day I placed the Flow hive box on top, they were in there busily making themselves at home.
I guess they had to replace the loss of all that honey.