When you are in a cut or deficit for an extended period of time your body adjusts to preserve energy. Your metabolic rate slows, you insulin sensitivity decreases, you decrease your ability to oxidize fat cells, you increase your ability to store fat. The last thing you want to do while your body is in this stage is to start packing on excess calories in effort to gain LBM. Your partioning during this stage is going to be leaned more towards fat increase over muscle increase.
1 month is not a long time to wait. If you have finished a cut it means you like a leaner look and lower body fat, if you want to keep that look work into the bulk slowly, otherwise you are just a yo-yo dieter that will live more at 15-20% rather than 8-12%.