找到解决的办法了，参考这个帖子https://forums.unrealengine.com/t/nanite-foliage-with-wind-sway-material-effects-placed-via-procedural-volumes-ue-5-1-0-may-seesaw-sway-together-with-all-other-foliage-in-the-same-procedurally-generated-volume/693655