Obviously it's a beta/server issue, it'll be fixed soon enough. The real question is whether or not mapmakers will be able to disable the delay on player inputs taking effect on your screen when there's lag - otherwise action maps could be totally ruined by even a little big of battle.net lag.
I highly doubt that's working as intended, i'm sure they will fix it.
I highly doubt that's working as intended, i'm sure they will fix it.