The following bug has been logged on the website:
Bug reference: 14942
Logged by: Cees van Zeeland
Email address: cees.van.zeeland@xs4all.nl
PostgreSQL version: 10.1
Operating system: windows 10
Description:
Maybe this bug is known.
CREATE TABLE AS (some_query)
gives a message:
Not connected to the server or the connection to the server has been
closed.
in PgAdmin 4.2
In psql it does not.