Dear author of this issue. Thank you very much for pointing out that something is not working in the planner. However, we have no idea what exactly you are referring to. Could you please attach a planning problem (domain and instance) where the issue occurs, and describe what is not working correctly.
Also, please note that we consider the rddl_prefix_parser as obsolete. We are not going to remove it from the repo at this time, but we will at some point.