I'll need to look into whether there's more evidence for the community-evolved theory of how these drops actually work. The current tracking assumes random rewards with equal chance, which may well turn out to be false (outdated).

Currently, Rarity just adds an attempt for all Island Expedition collectibles regardless of which map was completed.

Since there's no way to detect what creatures are present, nor to differentiate drop rates by difficulty, I doubt this can be improved.

Sort-of related: There are at least two items that aren't ingame, but have been added to the addon. This means that they will show attempts even if there's no way to obtain them.

If they ever are implemented, the attempt counts for those items would likely have to be reset or the entries purged from the SV DB.

https://www.wowhead.com/item=164377/regenerating-banana-bunch#comments

https://www.wowhead.com/item=164372/jinyu-light-globe#comments

Island Expedition rewards such as mounts, transmog items, pets, and quest items are based on the creatures present on a visit to a particular Island, NOT based on what you kill.

Source: wowhead

Therefore, this needs to happen:

• Adding new collectibles for Tides of Vengeance
• Adding the two new IE maps to the detection routine (?)
• Reworking the detection algorithm. IF it is possible to detect what enemies are present AND it's also feasible, then individual items could be correctly tracked. It sounds like a LOT of work, however, so I'm not counting on it happening...

Exactly how certain items are rewarded is unknown but currently they are random rewards at the end of Island Expeditions. The higher the difficulty of Island Expeditions the more likely you are to obtain items at the end of the Expedition. Also the enemies you might encounter while exploring Islands seem to be related to the items awarded at the end

Source: wowhead

In Tides of Vengeance, the chance of earning cosmetic rewards will depend solely on the denizens you encounter on the Island! You will no longer need to kill specific creatures to have a chance of earning cosmetic rewards.

The chances of earning cosmetic rewards are still higher on higher difficulties.

Source: wowhead

It also appears at least SOME of the collectibles are available from completing the Treasure Map missions, such as this one here

This is looking more and more like a giant headache.