Postgres 10, changing user by "set role {user};" doesn't use that users "default_transaction_isolation"

Steps to duplicate

ALTER USER {user} SET default_transaction_isolation TO 'repeatable read';

psql -U {user}
SHOW default_transaction_isolation;
with correctly show 'repeatable read'

psql (default with postgres)
set role {user};
SHOW default_transaction_isolation;
will incorrectly show postgres's value?
'read committed'

Thanks for the Awesome work.