We removed bookmarks. They weren't used all that much, and we already have a way of knowing which commits you liked: stars.
So the "saved" section has been replaced by "starred", and shows everything you ever starred before. If you had bookmarks, they were converted to stars as…
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ad12d60
Might have been a bit premature decision, as there's not enough content in circulation for bookmark's usual use cases.
One might want to track how certain commit types are progressing, or simply come back later to dive deeper if it's a tutorial, or a repo/article URL they're not necessarily endorsing with a star at that point.
Either way, if it feels like a mistaken edit, it's a simple revert so you're good.
commit ad12d60