Postgresql protocol not using RBAC row policy

[UnamedRus]

How to reproduce
Clickhouse version 21.5

 CREATE TABLE xxx_table (val UInt32) ENGINE=MergeTree ORDER BY val;
 INSERT INTO val SELECT * FROM numbers(10);
 CREATE ROW POLICY xx_policy ON default.xxx_table FOR SELECT USING val = 2 TO postgres;
 
 
 default=> SELECT * FROM xxx_table;
 val
-----
   0
   1
   2
   3
   4
   5
   6
   7
   8
   9
(10 rows)



LAPTOP.localdomain :) SELECT * FROM xxx_table;

SELECT *
FROM xxx_table

┌─val─┐
│   2 │
└─────┘

Additional context
Related #22572