In the new UI, we have a timesheet for a user that shows as submitted, but if we go to the "Review and Approve" tab, it does not show up there for us to be able to approve or reject it.
The problem was caused by the fact that the resource for which this time sheet was submitted, had a hire date set to a date after the period for that submitted time sheet.
"User-A" has a hire date set on their resource record as 6/1/2018
A timesheet was submitted for this user for the time period of 5/20/2018-5/26/2018
Because the hire date of the user is after the specified time period on the timesheet, the timesheet wont display in either the classic UI, nor the New UI
To be able to view this submitted timesheet, we had to change the hire date on the resource to a date that was before the start of the time period on that submitted time sheet. After doing so, we are now able to see the timesheet in both Classic and New UI.