Thank you for clarifying that info for me Viedra.
When large animals or sharks don’t spawn on a custom island, does this include “locking” an animal when creating an island to ensure it is added? Sometimes to prevent the island being overloaded in the creator, not everything will be added to the island, but you’ll normally receive a warning when this limit is reached.
Given the different ways these issues are affecting your save, it may be worth it for the team to take a look at a copy of your save to help them to test and replicate the different issues mentioned. Unfortunately the team cannot fix and return individual saves, but they would use your save in working to release fixes for the community as a whole.
If you’re happy to share your save with the team, you can find instructions here: [Save File Request]