Here is one roundabout FSDb struggles with - (47.567945441354084, -122.05498772278888).Note that there has been some changes to this roundabout recently - the weird lane that is going around the roundabout (close to East Lake Trail) is closed now.
The main problem is - there are two lanes that enter the roundabouts. One from 43rd way is particularly troubling because the main traffic direction is the East Lake N/S (left/right in the picture - D to C). So, the vehicles coming from the top on 43rd (A,B) have to wait for vehicles coming from the right (D) on East Lake.
FSD struggles with this most when I have to turn right (A to C). The car correctly takes the right lane (A) - but usually there will be other vehicles that are in the left lane (B), partially blocking the view of vehicles from the left (D) of the roundabout. I've to almost always brake here because it seems to lose track of vehicles coming from the left (occluded by vehicle standing on the left lane, B, waiting to enter) and starts to enter the roundabout.
When I've to go from East Lake (Noth/left) to 43rd - again we have two entry lanes. FSD correctly takes the left lane F, after entry goes directly to the inner roundabout lane - goes around the roundabout and exits to 43rd correctly most of the time. This is probably because there are no vehicles occluding the view to the left and moreover as I said vehicles are mostly going north-south on East lake (left/right in the picture), so not many vehicles usually come from 43rd. BTW, this used to fail most of the time before 69 - but has been working consistently in 69.2, one of the reasons I've a lot more zero disengagement drives.
When I have to go from East Lake (right) to 43rd - there is a short-cut lane that doesn't use the roundabout - G. This is essentially a protected right. But FSD will slow down to a stop almost every time - needing me to push the accelerator.
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