Some customers aren't showing up inside the customer organization immediately after adding them to the organization

Issue Summary

Some customers aren't showing up inside the customer organization in the customer's section. If you search them through email, they show up with the organization right beside their names.

Effectively, they are members of the organization, but not visible through the UI.

Steps to Reproduce

1. Go to a JSM project
2. On the left sidebar go to customers
3. Select an organisation
4. Add a customer to the organization
5. Go to the organization page again

Expected Results

The customers should be visible inside the organization.

Actual Results

Some customers don't show up inside the organization, they are only searchable through the customer's page.