In October, I've made some footages of Iceland. Generally speaking it wasn't bad. However, the footage taken at the Thingvellir national park turned out to be very strange. If some details are very clear, the landscaping is totally blur. It was filmed on 4K with a 8 filter. I don't remember the framerate.
my guess is that it has to do with focus. at first you are filming long distance landscape - at 2.03 you begin to pan down over trees and a house which are at a nearer focal point than the previous 2 mins. You did not refocus manually and since you were moving and still had some far range view in the shot the mavic stayed focus on that and did not refocus automatically to accomodate your birds eye view of the house ? Maybe?
I'm guessing you are noticing what's called the watercolor effect, or sometimes the oil-painting effect, presenting in low-light and underexposed footage when DJI's noise reduction kicks in and produces smudgy looking effects. The Mavic Pro's camera really needs a lot of light to shine. As A CW says, setting sharpness to +1 can help in such lighting conditions.