This bug most annoyingly also affects Villagers in Minecarts. This messes up my Minecart-based villager trading hall. Often when I send a villager on its way it looks like only the minecart is moving and the villager stays behind. Not so! This is the bug in action. To avoid confusion (and possible further complications) I need to move away far enough and then come back to have the villager show up in its proper place, namely in the minecart.
This bug of course also affects other mobs in minecarts.
There appears to be a general problem at Mojang with assigning bugs to someone who will work on it. If you search for bugs that are not Resolved and order by Votes (Advanced search: Status != Resolved ORDER BY Votes) then you'll see that of the top 10 voted bugs only 3 have been assigned. Of the top 20 only 4 are assigned. Of the top 50 only 15 are assigned. This bug is currently 7th in this list.
[Edit: Pestering via youtubers is a bad idea]
@unknown you make a good point. Edited my post accordingly.