[BLOCKING] Entities following target entities across half slabs and full slab blocks have issues.

Verification build: Release_648412

Better since discovered but still occurring in: Release_1.2.11 r/0h3

Summary: Entities following another target entity will spin in circles, get lost, pause or sometimes not even see their target if they step onto a half slab or full slab block. In our case we are using a Mooshroom tracking a Pig. The Mooshroom follows the target across full blocks without issue but as soon as it makes contact with a slab or full slab block it will begin to act strangely. We also have a Zombie Pigman following a sheep across the same blocks as well as a Vindicator following a cow. All seem to act differently when crossing slabs and full slab blocks. We are also experiencing it with evokers

Impact: Prevents us from having flawless movement across our environment for our entities which our map uses a lot of. Blocking our content

Repro Steps:
1. Use the attached behavior files. Mooshroom(sugarrush_mount) and Pig(sugarrush_target).
2. Load a world and spawn a Mooshroom and a Pig.
3. Teleport the Pig and the Mooshroom should follow.
4. Test to see its behavior when crossing slabs, full slab blocks and regular blocks.

Observed Results: Entities will not path correctly when moving to a target across slabs and full slab blocks.

Expected Results: Entities will path normally to a target.

Note: This behavior did not seem to occur in Release version 1.2.9. But is happening in the 1.2.10 dev build.

Also the video file size was too big to be attached but you can find it as an unlisted video here: https://youtu.be/IP4ti_MCWhw