Wait, after you lose to an enemy, unlock the CG in the gallery, view the CG, then go back into the game, you are not able to Dash anymore? At all?
I tried reproducing this bug and I couldn't. I unlocked Wolfie's CG, watched it in the gallery, tried Continuing a game and Dash was fine. I also tried the same method but starting a new game and Dash was still fine.
If you can, can you lay out the steps to reproduce this, or record a video of it happening? That would help me fix the issue!