Diablo II Resurrected has been updated to version 1.009 today by Blizzard. You can find out the complete patch notes from here.
This patch is only related to a minor crash that was occurring when the player was disconnected or connecting to game servers. So if you were one of the affected users, it is time to download the new update which should be available to download now. As is usually the case, you can just take a look at the patch notes below, or you can go to the support forums to have a look yourself.