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The following bug has been logged on the website:

Bug reference:      16746
Logged by:          Krzysztof Gradek
Email address:      kgradekx@gmail.com
PostgreSQL version: 12.5
Operating system:   Centos
Description:        

Hi
I just migrated my app to PG 12.5 and jumped into an issue which didn't
exist in PG12.3: the password provided in connection URI is ignored by
connect meta-command.

Steps to reproduce: 
1. open PG12.5 psql
2. run connect command using connection URI -> instead of opening the
connection I get password prompt.

    $ psql
    psql (12.5)
    Type "help" for help.

    postgres=# \connect
postgresql://ph_quartz_user:password@127.0.0.1/ph_quartz
    Password for user ph_quartz_user:

Same sequence using earlier version:
    $  /usr/pgsql-9.4/bin/psql
    psql (9.4.4, server 12.5)
    WARNING: psql major version 9.4, server major version 12.0.
             Some psql features might not work.
    Type "help" for help.

    postgres=# \connect
postgresql://ph_quartz_user:password@127.0.0.1/ph_quartz
    psql (9.4.4, server 12.5)
    WARNING: psql major version 9.4, server major version 12.0.
             Some psql features might not work.
    You are now connected to database "ph_quartz" as user "ph_quartz_user"
on host "127.0.0.1" at port "5432".

Of course, 9.4 is very old version, but the same test at another env with
PG12.3 succeeded (I could connect).

I have checked various options for the connection string (as described in
https://www.postgresql.org/docs/current/libpq-connect.html#LIBPQ-CONNSTRING),
none worked. It looks like the password parameter is simply ignored.
 

Also, I have checked the changes done to PG 12.5 - I found that 3 recent
commits relate to the connect meta-command (src/bin/psql/command.c):
   
https://github.com/postgres/postgres/commit/1b62d0fb3e50ede570d0d4e4a2be69d5645b48a7#diff-657963643e...
   
https://github.com/postgres/postgres/commit/94929f1cf6cb3ea070d0919d1303379b525a72a3#diff-657963643e...
   
https://github.com/postgres/postgres/commit/85c54287af56fe351b53913ea2b81e9d6145f964#diff-657963643e...

I cannot explain where is the issue but IMO the problem stems from these
changes.

Hope, you can help.
BR