Ue4.3 bug or not ? Object channels

Hi Everyone,

Short question, i’ve created 2 new object Channels in the edit project->Engine->Collision
Even if Those two new channels are saved in the editor (i guess in the saved folder), those object channels are not exported in the game engine.ini causing in my build some problems related this lack of New channels.
On another side in the same menu i can observ that the “set as default” button , stay in gray and is so unavailable too.

so is anyone experiencing this problem too and have a solution Thanks in advance