In general, the case number is only available after acceptance. Unless there are some special circumstances, the court will also have your situation when it is temporarily unable to grasp it. For example, some cases may have been prosecuted by others, but they may be suspected of criminal cases. If the case really contains criminal elements, the court can only reject it after accepting it. In order to reduce the procedural operation, the court will have a situation similar to yours.
There are also some very special situations, such as dealing with some historical issues, such as homestead. If there is no unified judgment in the local area, this situation may also occur, and the court just drags on not entering the formal proceedings.
Court acceptance means that it has entered the formal litigation procedure, but limited by the procedural law, some courts have made this non-statutory procedure in order to avoid embarrassment.