Hi ! Another bug spotted : when the power crystal is destroy and the Castle doors are unshielded, you must meet Macil in the Front base.
Their, when dialog is engaged, a music set on. Switching with the current front base music.
I am that stage of the game and no music is played.
ps : I'd bet this issue is the same for everytime a mission is complete and this music must be set on during a cinematic.