In a series of relevant questions in the ArcGIS Survey123 web app, the web app retains relevant answers when the user goes back and changes their response to the parent question.
This is a duplicate of BUG-000146623. The read-only method cannot be used as the relevancy causes a dependency cycle and returns "ODK Validate Errors" stated in (https://community.esri.com/t5/arcgis-survey123-questions/confirm-answer-delete-overwrite/td-p/857679).