The key is managing team performance.
This is a business-wide rather than job share unique issue. Most organizations have internal politics managers need to navigate to deliver the best results.
But if after discussing it internally the job share team can’t find a solution, they should:
1. Understand why - gather feedback.
2. Make and discuss a plan to mitigate the one-sided issues.
3. Communicate the job share ethos and structure back to the business
The key is managing team performance in the same way as any employee.