I am writing this just in case it helps someone. I found that if I use the Normal from a Geometry node, then I have got the same result regarding the moss without applying any rotation to the stones.
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Why to mix geometry nodes here? This course goes with the purely destructive modeling. Geo nodes are programming, they even have loops, then suddenly they have no step-by-step debugger. From programmer’s point of view, non-debuggable language is useless. I am happy to stay with the destructive or with Python.