Hi. If you open a survey record in edit mode, the values shown in the form will be the ones from the record you are editing. The value you are passing to the Location field is simply been overwritten by the value in the record. It is not possible to load an existing record AND also pass a value to an attribute.
As a side note, you may want to move away from using objectId values to load the record and switch to globalId. For more details see this post: https://community.esri.com/groups/survey123/blog/2020/02/19/upcoming-changes-to-survey123-web-forms-...
