BUG #17981: HY000 server closed the connection unexpectedly

The following bug has been logged on the website:

Bug reference:      17981
Logged by:          Sayan Oruspay
Email address:      sayanoruspai@gmail.com
PostgreSQL version: 12.1
Operating system:   Windows 10
Description:

I am writing an application that connects to the local database through
psqlodbc version 13.02. And when I manually stop my database service, I get
sqlstate HY000 and message 'server closed the connection unexpectedly ...'.
Should not it be something like 08S01? Also SQLGetConnectAttr(GetHandle(),
SQL_ATTR_CONNECTION_DEAD, &dead, SQL_IS_INTEGER, nullptr); does not produce
right answer and dead is returned equal to SQL_CD_FALSE.