So localized resources Driftkelp and Fairy Mushrooms used to be (and still is) a very strong modifier components in any of the foods they used with.
With latest change of fixed hunger to FEP ratio, using this components automatically means that hunger generated for the food will be highly bloated, which makes such foods not as viable as others.
It also affects Heartwood leaves, which is food ingredient too, although it has more unique uses such as gilding or travel weariness food.
As a result, those resources were inadvertently nerfed, and not as used and traded anymore in this world as they were in previous.
If they could be buffed in future that would address the issue.