Steps to reproduce the issue
https://github.com/joomla/joomla-cms/blob/4.0-dev/administrator/components/com_admin/sql/updates/mysql/4.0.0-2018-06-03.sql#L16-L17
still contains custom_data, system_data
INSERT INTO
#__extensions(
extension_id,
name,
type,
element,
folder,
client_id,
enabled,
access,
protected,
manifest_cache,
params,
custom_data,
system_data,
checked_out,
checked_out_time,
ordering,
state,
namespace) VALUES (35, 'com_csp', 'component', 'com_csp', '', 0, 0, 1, 0, '', '{}', '', '', 0, '0000-00-00 00:00:00', 0, 0, 'Joomla\\Component\\Csp');
which were removed.
same for postgresql
Set to "closed" on behalf of @franz-wohlkoenig by The JTracker Application at issues.joomla.org/joomla-cms/20897