The bug

Baby villagers can now farm crops and trade as of the 1.13 update aquatic.

Steps to reproduce:

1. Create the crop farm designed by m0rsk:  https://www.youtube.com/watch?v=dbz4xfzwMIc (note that due to another unrelated bug, the waterless version of the drop shaft must be created, as the water will update the crop land next to the villager)
2. Spawn in a baby villager
3. Kill the villager if it is not a farmer (I could not get any villager type other than the farmer to harvest crops; I'm not sure if this is intentional or not, but in 1.12, any brown coat could farm crops)
4. Watch the baby villager harvest crops. It can be clearly observed that the baby villager now has an inventory, something that didn't occur in 1.12.

I spent a lot of time trying to debug my crop farms in 1.13, only to discover these nuances.  I have noticed that this doesn't always occur; I haven't been able to fully understand what the issue is.  I've attached an image of a baby villager farming below.