Talk:Updates/@comment-72.95.91.83-20190705130215/@comment-25550759-20190705164116

You should, yes. The last time that existing worlds were broken from an update was for the update from Minecraft 1.6 to 1.7, which broke existing worlds due to block id changes. Plus, there would likely be a lot of community backlash if suddenly all worlds were broken by a new update.

TLDR; It's been years since an update broke preexisting worlds, so you can expect this update to be the same.