When using a flicker effect on my commander in brawl that returns the creature to the battlefield at the end of the turn, such as that found on Charming Prince or Phelia, I am given the option to put my commander back in the command zone, or decline.

If I choose decline, my commander remains in exile, forgetting that it was supposed to return to the battlefield. If I choose to put it back in the command zone, then it also forgets it was supposed to return to the battlefield at the end of the turn and I have to recast it.

This is rather annoying, as I want to have my commander return to the battlefield for it's ETB, but instead it's gone forever or I have to recast it. This has cost me games, and has forced me to take these useful strategies out of my deck.