[B4] Tasks Method Changed

I started self hosted of v5 with a clean install of Beta 1 and have upgraded each time the new betas have come out. I noticed after upgrading to Beta 4 that some things didn't seem to update as quickly as they did in the other versions, or that I would have to go in an manually clear the cache to get some things to update. Today I happen to go in and look at the Task Method and noticed that it was set to Run Automatically With Traffic. It had been configured to run with Cron ever since I set it up originally. When I switched it back it said that the task.php wasn't set to 777. Sure enough, the permissions had reverted back to 644. So, not sure what has happened, but is it possible that that could be changed while upgrading, since I definitely didn't go back and change anything since originally installing v5