This also happened to me back on Nov 10, 2021. I had an old LastPass account, wasn't using it, when all of a sudden i get an email:
--
Login attempt blocked
Hello,
Someone just used your master password to try to log in to your account from a device or location we didn't recognize. LastPass blocked this attempt, but you should take a closer look.
---
Like you, it told me that the attempt came from Brazil, using an IP address starting with 160. I have no idea how they would've gotten that password. Made me wonder if LastPass had some issue, but nothing was in haveibeenpwned
-- Login attempt blocked Hello,
Someone just used your master password to try to log in to your account from a device or location we didn't recognize. LastPass blocked this attempt, but you should take a closer look. ---
Like you, it told me that the attempt came from Brazil, using an IP address starting with 160. I have no idea how they would've gotten that password. Made me wonder if LastPass had some issue, but nothing was in haveibeenpwned