Not receiving events for all users via sync start

This is in regards to Zendesk Sell. We use this endpoint https://developer.zendesk.com/api-reference/sales-crm/sync/reference/?_ga=2.179548653.837193003.1669626299-268122732.1653560942 to receive events with respect to user creation, updation and deletion.

It looks like we are not receiving activities for all users.
For example: We use /v2/sync/%s/queues/main where %s is syncId. From this we filter out the meta.type "user". We saw that we have received events for 12 unique users when using sync and queue.
On checking the users endpoint https://developer.zendesk.com/api-reference/sales-crm/resources/users/ we see there are 32 users in total

Is anyone aware of any constraint here or we receive only events for a particular set of users.