pgAdmin4 9.16 error on object focus in Object Explorer

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Describe the bug

Clicking on an object, such as "Tables", "Functions", "Views" displays an error message.

Error message

When I click on Table:
column att.attcompression does not exist
LINE 39: (CASE WHEN att.attcompression = 'p' THEN 'pglz' WHEN att.at...

When I click on Function:
function pg_catalog.pg_get_function_sqlbody(oid) does not exist
LINE 10: pg_catalog.pg_get_function_sqlbody(pr.oid) AS prosrc_sql...
^
HINT: No function matches the given name and argument types. You might need to add explicit type casts.

When I click on View:
can only concatenate str (not "Response") to str

Screenshots

Desktop (please complete the following information):

• Windows 10
• pgAdmin4 9.16
• Desktop

[eithe]

This is probably due to running an unsupported version of PostgreSQL, and perhaps(?) this PR #10054

9.16 supports 14-18 (source)

I am seeing this issue with a PostgreSQL 11.x instance.

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I forgot about the "unsupported version of PostgreSQL," and yes, that's true.