BUG #16743: psql doesn't show whole expression in stored column

The following bug has been logged on the website:

Bug reference:      16743
Logged by:          David Turon
Email address:      turon.david@seznam.cz
PostgreSQL version: 12.5
Operating system:   CentOS 7
Description:

Good morning,

when generated column expression length is larger then some value - the rest
of expression is cut in \d[+] output:

CREATE TABLE test(
    a text,
    b text,
    c text,
    d text,    
    ts_vector tsvector GENERATED ALWAYS AS (
            setweight(to_tsvector('simple', COALESCE(a, '')), 'A') || 
            setweight(to_tsvector('simple', COALESCE(b, '')), 'B') ||
            setweight(to_tsvector('simple', COALESCE(c, '')), 'C') ||
            setweight(to_tsvector('simple', COALESCE(d, '')), 'D')) STORED
);

postgres@pgdist:test=# \d test 

               Tabulka "public.test"
  Sloupec  |   Typ    | Collation | Nullable |
                                           Implicitně
                                                   

-----------+----------+-----------+----------+---------------------------------------------------------------------------------------------------------------------------------------------------------------
 a         | text     |           |          | 
 b         | text     |           |          | 
 c         | text     |           |          | 
 d         | text     |           |          | 
 ts_vector | tsvector |           |          | generated always as
(((setweight(to_tsvector('simple'::regconfig, COALESCE(a, ''::text)),
'A'::"char") || setweight(to_tsvector('simple'::regconfig, ) stored

psql (12.5) server/client

pager is off, only way to show whole expresion is use pg_dump i think. Maybe
it was the intention and isn't bug. Thanks. 

Best regards
David T.