On my end I had a similar issue to the one in Johnibur's comment above.
1.14.3 release: I tried to throw a bunch of items (seeds) at the villager, the villager picks up 4 stacks of items and then stops picking up more. However, after a little while, the floating seeds disappears (I'm sure it's not due to despawn because there are more seeds on the floor). I'm not sure if they are picked up by the villager or just become invisible as some other reports suggest. But it seems that only when the play is absent from the villager's sight the villager will perform this magic...
Achilles
On my end I had a similar issue to the one in Johnibur's comment above.
1.14.3 release: I tried to throw a bunch of items (seeds) at the villager, the villager picks up 4 stacks of items and then stops picking up more. However, after a little while, the floating seeds disappears (I'm sure it's not due to despawn because there are more seeds on the floor). I'm not sure if they are picked up by the villager or just become invisible as some other reports suggest. But it seems that only when the play is absent from the villager's sight the villager will perform this magic...