4.24, 4.25 and 4.26 this issue still exists.
HOWEVER, I have a really easy permanent fix for this. The solution: rotate the sun on a very slight angle that no one would ever notice. Set the starting rotation of the directional light tied to your sky sphere to (1.0, 88.0, 1.0) or similar numbers. This will force the sun to rotate on a slight angle and it will never be able to hit 90 or -90 in pitch.
