This is one of those things I don't think was happening until recently, but can't say for sure how long ago it actually started.
I work a lot with AWS, which has a large number of services; recently 1Password has decided that the services search/autocomplete is a valid target to suggest items to autofill, which obscures the search results and makes it generally a lot harder to work with.
AWS has a track record with their UI, so it's unlikely to have changed nor be changed even if it's a case of them misusing DOM elements & attributes, so I'm wondering if 1Password could add an exemption for this input.
The search box has an ID: awsc-services-search-autocomplete so that could be targeted easily without mistakenly hitting other elements
Long term it would be cool if 1Password supported a similar feature to adblockers, letting you provide DOM selectors to exclude fields from being autocompleted, but unless such a feature is right around the corner, this would be a quick & easy solution
1Password Version: Not Provided
Extension Version: 1.19.1
OS Version: Windows 10
Sync Type: Not Provided