Fox 40 Factory GRIP2 loud knocking on impacts – fork works perfectly

Hi everyone,
I have a 2023 Fox 40 Factory GRIP2.
The fork works perfectly, all adjustments work, and there is no noticeable play in the fork.
I also took it to a bike mechanic, and after a quick inspection he said he doesn’t think the problem is inside the fork or the damper, but he didn’t have enough time to inspect it further.
The fork makes a loud knocking/clunking noise when hitting bumps or landing drops.
Has anyone experienced this before? What else could cause this kind of noise?
Thanks!