Wrong error hints for internal-use-only columns

[Piiit]

A=# select * from ((select * from rt) rt(rn, t) align rt s on true with (rn_1,a,p1,h)) x;     
ERROR:  column rt.rn_1 does not exist                                                         
LINE 1: ...ect * from rt) rt(rn, t) align rt s on true with (rn_1,a,p1,...                    
                                                             ^                                
HINT:  Perhaps you meant to reference the column "rt"."rn_0".                                 

rn_0 should not be visible here!