This bug is related to BUG-000098492 - Default date and time values do not auto-populate when using repeats in Survey123 for ArcGIS.
I have discovered that a variation of the bug mentioned above (fixed with Ensiheim-meteorite-strike-day-release-19 release) is still present.
The following workflow reproduces the bug:
Execute the survey:
BUG-000098492 was fixed and closed as part of our 3.0 release a few weeks ago. We made several fixes and improvements to defaults, calculations, relevant and repeats in this release. Can you please test with 3.0 and let us know if you are still experiencing the issue above.