Thank you very much for the suggestion. Unfortunately, it didn’t resolve the issue.
I’m using the default settings in Unreal Engine 5.6 with Virtual Shadow Maps enabled. I simply opened a new project, added foliage using the Foliage Paint Tool, enabled Nanite, and applied a material with World Position Offset.
If I disable Evaluate World Position Offset, the shadows appear correctly. But I need it enabled for wind animation in the trees.
Everything worked perfectly in Unreal Engine 5.5, so this seems to be a regression in 5.6.