navigation.generic doesn't allow climbing

Windows_Minecraft - Release_891562
(RC 1.4.0.1)

Summary:
Attempting to use the navigation.generic component in a behavior pack keeps you from being able to make the mob climb. From Alex Wilkinson:

"it looks like `navigation.generic` has the flag for the pathfinder, but hasn';t actually hooked up actual navigation of it
So, it looks like `navigation.generic` needs to properly use the can_climb flag to actually navigate up things to climb
So, yeah. the problem is we haven't hooked up the climbing behavior into the generic navigator"

Impact:
This would be the best method currently available to make a mob who can pursue you in water, on land, or by climbing, and it is currently impossible.

Observed Results:
Mobs cannot climb via this method.

Expected Results:
Mobs should climb via this method.

Screenshots/Videos attached:
No