Proxy users - flags = PROXY MAY ACTIVATE ROLE/PROXY MAY ACTIVATE ALL CLIENT ROLES

in 12.2 RAC database. We have been using proxy for a long time.

To give proxy to a user, we have always run the following syntax:

1. ALTER USER phx_prod GRANT CONNECT THROUGH ksmith;

the result will show:

Today I ran this and the flags shows "PROXY MAY ACTIVATE ALL CLIENT ROLES". I cannot figure why these flags are different although, I ran the same sql?

1. ALTER USER phx_prod grant CONNECT THROUGH DMILLER;