In this paper, we prove that the open Gromov–Witten invariants defined in  on K3 surfaces satisfy the Kontsevich–Soibelman wall-crossing formula. One hand, this gives a geometric interpretation of the slab functions in Gross–Siebert program. On the other hands, the open Gromov–Witten invariants coincide with the weighted counting of tropical discs. This is an analog of the corresponding theorem on toric varieties  but on compact Calabi–Yau surfaces.
"Correspondence theorem between holomorphic discs and tropical discs on K3 surfaces." J. Differential Geom. 117 (1) 41 - 92, January 2021. https://doi.org/10.4310/jdg/1609902017