There was no client update, just background maintenance.
https://www.bungie.net/en/News
English
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If the maintenance could not affect the players then why @BungieHelp wrote "Destiny 1 and 2 maintenance is complete. Players who observe issues should report to the Help forum"?! I think Bungie could show us the changes/fixes solved too despite that be background maintenance.
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There were no changes. Players were removed so that they could perform regular maintenance on their backend systems.