Looks so gorgeous! How did you convert it from built-in to HDRP?
Viewing post in The Flooded Grounds HD Remaster comments
It was very tedious. The building materials were easy enough, the trees were the main problem; I swapped them out for trees from the Book of the Dead. I kept the existing terrain and went into the tree section and used the edit tree drop down to change them out. I swapped out a different ocean package and sky package as there was no volumetric clouds or water solution at the time.