Rabbits are unable to jump up a block if said block is half-aligned with the grid using slabs. Perfect block alignments work normally.
Related issues
discovered while testing
testing discovered
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Relates to MC-106905

Testing discovered MC-144624

Fixed as of 1.14.1 pre release 2, it seems
Closed as a duplicate of MC-134847.

Can't see how this would be considered a duplicate, since rabbits obviously can pathfind to the player, they just can't jump high enough.
Prior to 1.14.1-pre1 mobs thought bottom slabs were air, hence the rabbit didn't even try jumping a full block upwards.