Sending emails to support@lastpass.com doesn't work ("This inbox is not monitored") and I have to upgrade my account to contact their support, which I'll do right away.
EDIT: after checking, the login attempt does appear in my Account History (my original email said it didn't -- I wasn't looking in the right place)
> 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.
Looks fairly classic. Might want to look at the email headers, to see if it really came from LastPass.
I get about ten of these a day. Some are scarily well-done.
Most are for banks that I don't use, but I also get a lot of attempts to grab my AppleID. My Apple (mac.com) address is an OG address, and has been making the spammer circuit for over a decade. I suspect that I actually get hundreds of spams a day, but Apple is good at nuking most of them, before they reach my inbox.
Try a bogus attempt yourself with wrong PW, or from a cloud host/vpn/etc to verify the audit log you can access.
Assuming it does list your attempts, then yeah, it would have to be phishing/lp bug.