Started a game with Wilbur after the update on 25th. The sound of standard actions (such as chopping a tree), comes after about a second later than where it should be. I didn't notice it at first, which may imply the issue was getting worse over time (or it may simply be my perception not working properly with all the excitement about the new update). Unfortunately I'm unable to give any more details than that. I don't know if a particular action has triggered the problem, of even if it is character specific.
Got hit by a coconut on the head when chopping down a palm tree once, on day 6 or 7, which may be the suspect since it is a new thing.
Play the game as Wilbur normally.