What we know is AR synthesis is increased and decreased (depends on a study) after AAS administration. So it’s density and activity is affected for sure.
What we also know is after a given concentration of AAS is maintained, your body mass increases for 6-10 weeks, then plateau. It isn’t known why exactly that happens, nothing is sure. Probably AR response to an agonist decreases and/or density of AR decreases after some time (negative feedback loop), so… Nothing new.