Zombies are targeting Villagers through multiple blocks, haven't encountered this on Bedrock prior to the 1.10 update. 

Zombies are are now targeting villagers from inside cave systems with no prior line of sight, Drowned are lining up at shores waiting for nightfall, and desert villages become deserted villages once a single Husk smells the wheat & potatoes growing from 30 blocks away. 

I understand if they're 'seen' by the zombies and are pursued, but this is unfortunately not the case. The attachments include pictures of the Drowned beach siege (Coastal Village seed) & a picture of three zombies inside a cave, located below my player-made village, tracking the Villagers through multiple solid blocks at a time (random seed/EX. Gameplay Enabled). 

Any information on if this is a change to the mechanics would be appreciated, thank you