Error for GRANTED BY in PG16&PG17 that does not happen in PG15

Hi, I observed some difference in behavior for granting roles.

Running as a superuser (postgres).

SQL:

create role test_group;

create role test_user;

create role test_su with superuser;

grant test_group to test_user granted by test_su;

Output on PG16 & PG17:

CREATE ROLE

CREATE ROLE

CREATE ROLE

ERROR:  permission denied to grant privileges as role "test_su"

DETAIL:  The grantor must have the ADMIN option on role "test_group".

The same succeeds on PG15.

This likely has to do with work that was done by Robert Haas on introducing this ADMIN option in PG16.

Surely doing “granted by some_superuser” should be allowed regardless of the ADMIN option though, right?

-Floris