Duanmu Huai had no intention of hiding this matter. In fact, he immediately told everyone about it upon his return.
Because Duanmu Huai understood clearly that many things can't be concealed. Sometimes, acknowledging the reality is more important than anything else. In fact, most defeats start from the inability to accept reality.
At the moment, there indeed has been trouble in the royal city. Fortunately, the Second Legion was not affected. After leaving the royal city, everyone visited the border between the Herman Kingdom and the Devil World. Everything there seemed in order and well-organized. The general of the Second Legion met with them, and his surprise and astonishment seemed quite genuine when he learned about the calamity in the royal city.
In other words, what happened in the royal city was not known to the Tribunal, the Loyalist Army, or even the Second Legion.
No one is clear about the situation inside.