This isn't great but it's not that big of a deal either. A lot of companies got bit by the Klue breach but it's not like your vaults are being accessed.
> Yes, in a separate breech.
Not nearly that cut and dry.
Many, not all encrypted vaults leaked out. If you lost data it was because you used a weak master password for that vault.
> If you lost data it was because you used a weak master password for that vault.
Even this is more complex (horrible pbkdf2 defaults, you're welcome for getting lastpass to increase them btw that was me) but it isn't relevant, no vaults are accessed in this breach.