I am facing the following error using 2.28. I have also tested this on play.dhis2.org/demo and am facing the same result.
When I go into tracker capture, any field that is a date, number, etc that does not use an option set does not appear in tracker capture. See the screenshot below.
This was ok in previous builds; I have only noticed it recently.
Shurajit Dutta (MPH, MHI)
Health Information Systems Adviser