GH4 Autofocus with ND filter

I've been doing some run and gun with the 14-35 2.8 pany lens and I realized that the autofocus (afs) with an ND x16 filter is very unreliable. (glass was clean) It takes forever to focus and is off 50% of the time. Could this be due to the new focusing system that relies on bokeh and contrast for specific lenses and that the ND filter messes this up? Manual with focus peaking works great though.
 
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