Events registration report API

We are calling the events registration report API below for a specific Event: Zoom Events API

Per the event portal, we have over 900 registrations and the registration report from the UI shows all of them.

Our code is calling for 300 per page and it was returning 298 on the first call and no next page token was included.

I’ve experimented with page size and
with 200 I was able to get 397 (200 then 197)
with 100 I only got 299 (100, 100, 98)
with 30 I only got 209 (30 (6 times), 29)

The API is seemingly not working as documented.