Hello there,
I've been playing with the mod "The Betweenlands" with its corresponding Dynamic Trees add-on for a while and I noticed an issue with one of the trees affected by this add-on. It's the Nibbletwing tree from the main mod which seems unable to drop its corresponding seeds for samplings making the tree itself an unrenewable resource, unlike its original version. I tried to gain the Nibbletwing seeds by shopping down multiple trees and breaking the leaves but there weren't any seeds. So, all that needs to be fixed is the Nibbletwing seed's dropping rate or resource. You can take all the time you need to fix it. Thank you for reading and considering this issue, and I wish you a safe day! :)

Fixed on 1.0.2