Update v2713 just contains a single bugfix:
When you start stepping from one square to another, you can now plant bombs during the first 3 frames of the step instead of immediately losing your ability to plant bombs on frame 1.
This has been a feature of the game since it first released, but it got broken during development of the Dungeon update. So if quickly planting bombs while moving felt a bit more difficult for you after the Dungeon update than it previously did, that's why. Sorry about that!