Too bad, the VND filters from PGYTech are going to be returned.
The color shift was too much for me to be useful (without quite a bit of post processing).
Since it was different depending on the angle of the light, it would be very hard to automate this.
(and that defeats the purpose of why I got a P2 in the first place.

This is a DNG output from P2 with the 6-9 filter set to 9 (the effect is most visible at max density).
It looks 'ok' but you can see the color shifting in the corners (getting more blue)



Here you can see it more prominently in the sky.

So it is back to the drawing board.
Probably going for the PGYTech ND filter set. ND 8-64 for regular video shooting.

And a Freewell ND1000 for this kind of motion timelapses during daytime.

I have the same VND 2-5 stops filter and has a blue color shift in the upper right and lower-left corner, and if I point to the sky, it will look like I used the polarizer filter and it looks awful.

Now thats a disappointment.   Did you secure the pocket for the time-lapse,  seems anyone walking past could have grabbed it.