What you have experienced confirmes my fear that Lastpass have been compromised. I currently can't get to any of my passwords after changing my maste password, as it became clear to me someone has access to the info in my account. Now I get logged out as soon as I try to access any of my passwords.
I think my account have been compromised too. LastPass support can't tell me if I been compromised. They gain access to many of my accounts and the login history is blank all the time. They tell me that I cleared it and that I cleared my browser history but I didn't. Even after I wiped all my devices, the login history is still blank.
Please do get in touch with me on your crypto losses. You can DM on Twitter. (https://twitter.com/tozzi21)