Manager Cannot See Two Employees Under My Team for Add Absence — Also Missing from Directory Search

We have a situation where a manager cannot see two of their employees under My Team when trying to Add Absence on their behalf. These employees should normally appear in the manager’s hierarchy but are missing.

Additionally, when searching in the standard Directory, these two employees do not show up unless we use Advanced Search.

Both employees are active and their employment info looks correct.

Has anyone else experienced this kind of issue? Could it be related to Oracle Search indexing, manager hierarchy sync, or something else? Any advice or suggestions on how to fix this would be much appreciated!