Hi
I have the same issue as explained here Discounts apply incorrectly to extras. That confirmed bug is from 2023, and it does not seem to be a difficult fix.
In short, discounts should apply to the number of nights booked only. But discounts currently also apply to extra options added. So if the listing has a discount of 10% if you book 3 nights, and a guest books 3 nights but adds a breakfast for 10USD per night, then the breakfast gets discounted as well. It should discount only the cost of the nights, not the cost of the extras (that’s why they are extras).
I believe the fix for this should not be too complicated, since it only has to exclude extras from the calculation.
Thanks!