When model is created in Open Building Designer and model having Polycuts, ProConcrete cannot able to detect the Polycuts while doing Rebar modeling.
ProConcrete has one issue that it is not able to detect Polycuts created in Open Building Designer. So to make Rebar follow the Polycuts, need to use Key-in. Please follow the key-in shown in below snap
Use Key-in "PROCONCRETE POLYCUT REBAR"