Single Check and Benefit Deductions

We are implementing single check and we came across a scenario that we think there is config for, but we can't find any information on it.

Scenario:

Empl rcd 0 - Not benefit primary, has hours being paid

Empl rcd 1 - Is benefit primary; has no hours being paid

Benefit deductions are not coming out of the check. We've checked all of the normal culprits (subsets, benefit flag primary job process, overrides, arrears, enrollments, etc.) and none of those seem to be the issue. We are using Benefits Administration, Payroll Options 2 is set as we have deductions taken = No override, Deduction Subset is blank.