I had just added some diamonds and just shortly after they added several rewards in the wildlife part for purchasing diamonds. Just saying.
In the future:
During events, always wait for the bonus currency offer. Given past patterns it will appear 3 or 4 times during the course of the event.
If you have a +diamonds offer, wait about 20-22 hours before buying to see if another offer appears on top of it - like event bonus currency.
Ditto the reverse, give bonus currency offers some extra time before you buy.
In Feb of 2023 (a day I remember like yesterday) I got 200% bonus currency offer 10 hours after the event bonus currency offer had popped up.
If I had bought in a rush I would really have missed out.