Why after I enabled the "Auto Merge" option for grass, the Wind (detail bendind) do not works anymore?

My grass just freezing after I’am enable this feature. Why?

Without it wind for grass works fine

For instance, same behaviour we can see in StarterGame for some of plants gyazo gif

how to fix this ? why this bug irregular? I mean for some plants “auto merge” works fine and for others it just freezing the plants?

Would love an answer to this problem. Remains a problem. I gave my grass vertex colors. Still doesn’t work.

edit: I discovered “automerge” bending doesn’t consider vertex colors from the docs. At any rate, this still remains a problem in that the automerge bending is not working at all.

I know why. The vegetation mesh needs an armature. Doh! Makes perfect sense.

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