Yes, this has been fixed in the upcoming 3.13 release which will be available this week.
It was originally logged as:
BUG-000138199 - Leading zeros are dropped from the values submitted by the 'select_one' questions in ArcGIS Survey123 3.12.
Please test out your workflow with the latest 3.13 release and let us know if you still encounter any issues.
thanks for your answer. That sounds really great. I'll test as soon as 3.13 is available in Google Play Store. As I read it should be released today? :beaming_face_with_smiling_eyes: (ArcGIS Survey123 Deprecation Notes (May 2021) (esri.com))