Unable to import/export database in Plesk: Internal error: [Account :: getPassword] can not decrypt password to be plain

Symptoms

1. Unable to import/export a database dump:

   PLESK_ERROR: Internal error: [Account::getPassword] cannot decrypt password to be plain.

2. Errors in /usr/local/psa/admin/logs/panel.log with debug mode enabled:

   CONFIG_TEXT: ERR [panel] Task failed: id=130, pid=111288, type=database-download, error=Internal error: [Account::getPassword] cannot decrypt password to be plain.
   DEBUG [panel] PleskFatalException: Internal error: [Account::getPassword] cannot decrypt password to be plain.
   file: /usr/local/psa/admin/plib/Account.php
   line: 73
   ...

3. Password of the domain database user is encrypted:

   # plesk db "select * from db_users where login=johndoe;"
   +-----+-----------------+------------+-------+--------+--------+--------------+--------+-------------+-----------+
   | id | login | account_id | db_id | status | dom_id | db_server_id | passwd | external_id | role |
   +-----+-----------------+------------+-------+--------+--------+--------------+--------+-------------+-----------+
   | 10 | example | 15 | 0 | normal | 12 | 1 | | NULL | readWrite |
   +-----+-----------------+------------+-------+--------+--------+--------------+--------+-------------+-----------+

   # plesk db "select * from accounts where id='15';"
   +-----+-------+-------------------------------------------+
   | id | type | password |
   +-----+-------+-------------------------------------------+
   | 15 | crypt | *ED642519186D3D29C6089E1D01B592D76B1EEC12 |
   +-----+-------+-------------------------------------------+

4. The domain was migrated from non-Plesk hosting and website is not working:

   CONFIG_TEXT: Error establishing database connection

Cause

Resolution

Workaround

If update is not possible for some reason you may try the following