Minor mines and damaged doors

[F-oh-ex]

In my recent playthrough I've noticed that I've been unable to open the damaged doors in Peragus dormitory sections with Minor Frag Mines - it seems to require Average or Deadly mine. Curiously enough, during the "Rescue PC" part, playing as T3, I was able to open the door using the very same item, Minor Frag Mine. 

 

Thoughts on this?

[Black_Rogue]

same here, some containers make u use powerful mines.  Personally  I don't like this since it removes the usage of minor mines from the game 'I use powerful ones to do more damage to units"