August's demeanor started to change from then on.
This was a dragon's process of maturing. Every single one of them would eventually go through it, but the actual "when" would differ depending on when they reached the appropriate power level designated by their ancestor.
For most, it would happen during or after their Universe Baptism. And for most, that would only come decades or centuries into their lives.
During the process, they'd adopt some of the traits of their ancestors while retaining the core of their personalities. This was the reason for the massive divide in thinking between each Dragon lineage, since they all functioned on a different pre-established ideology.
Nevertheless, even for dragons from the Holy Clans, ancestral memories took decades to unlock. Their geniuses weren't influenced by them until they were properly ready.
August didn't have the same privileges, because the Azure Dragon didn't have those privileges.