More specifically, it appears that the visualizer is no longer showing owned squares with strength 0 as strength 0. Instead it immediately gives them the production strength. This only happens if the square does not move that turn. If it does move, the correct strength is shown.
For example in https://halite.io/game.php?replay=ar1483415861-2876991088.hlt:
At frame #7 both squares have moved, but they already have their production strength.
At frame #8 location 20,10 now has strength 10, when it should be 5.
At frame #9 it is 15.
At frame #10 it is 15 again - this time it has the correct strength because it is making a move.