I have noticed similar behavior in Experience Builder, but there is a solution for it (https://community.esri.com/t5/arcgis-experience-builder-questions/search-requires-selection-twice-and-results-panel/m-p/1309510). I am running into a similar issue in a Survey123 Web Form.
In the app, I can tap one of the search suggestions and it populates the Address question. However, when the survey is accessed through the web form, the suggestion has to be selected, then after clicking on the search bar again, the suggestion is tapped again (video snippet attached).
Is this expected behavior? I thought it might have to do with there being 2 locators in our organization, but I cannot limit the survey to only use one.