A collection of fixes for Hammers of Fate

This is just a sand texture. River-bed in Sand and River-bed_grass in Grass suggests a place between water and land, where heroes can go. Or am I misunderstanding the correction?

No, everything is working correctly. Try getting into a boat and listening to the soundtrack.
You just need to wait for the first soundtrack to finish, which plays first and depends on the location.

Added 1 minute ago
This file indicated that the Academy theme was playing on the water.