I HAVE a similar problem. I've had to disable LastPass on a number of websites when internet shopping, because when I'm trying to enter my address, the LastPass pop-up/drop-down blocks the options the website is offering for suburbs etc. Would be good if LastPass could suggest fill content in a way that didn't interfere with the website's functionality.
This option is not effective as that ALSO prevents LastPass from filling in credentials to login to the site. This functionality needs to be limited to only suggestion of the autofill of addresses.