Search as you type field not working as expected

My understanding of the Search-As-You-Type functionality is that it implements an Autocomplete search providing suggestions from values on the field as you type. Either I am doing this incorrectly, or there is another issue that I don't understand.

I have added the node Title field to the search index and assigned it "Search-As-You-Type". I created a Search Index View with an Exposed Filter and enabled Autocomplete and tried the following different options, but none of them provide suggestions. However, they all do provide valid results if I enter a relevant search term.

Filter on attempts:

- Title field (Data Source)
- Rendered HTML output (Search)

I tried adding the Title field to and Aggregated field in the index and tried that in the view with no luck.

- Aggregated field (Search)