Add non-vanilla trees to shader pack?

Greetings! I’ve been really enjoying Iris and stumbled upon the “Let’s Do” series of mods - “Let’s Do Vinery, “Let’s Do Bakery, “Let’s Do Beachparty, etc. these come with custom trees, however they don’t seem to move in the wind like the trees around them do - so they look a bit… out of place. Is there a way to fix this?
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