Well, my problem is basically and mainly in the villagers, which happens with the villagers, simply when creating any world the villagers grab any item that tires them (carrots, potatoes, etc.), but after a while in the world no villager in that world I no longer want to collect any item alone, to see if it was simply a mistake of the world, I have created another world and tire elements for the villagers and they take it, but any world where I play for a long time no longer want to collect items, I even try spawning myself by villagers to see if these items catch and even so so it is not that they have their inventories full and for these, they do not catch them, SIMPLY, when a time in the world they do not want to pick up. This error or bug is not exactly what has been happening to me since several previous versions, 1. 14 1.14.2, etc, the same thing happens to all of them. I have been having this problem for a long time and it does not allow me to do, for example, villager farms. If you could tell me why this, I repeat, does not have full inventories or anything the same happens in snapshot 1.16 versions with foxes and piglins, they do not collect any items, even though I have not changed snapshot versions. 

Sorry if I have mistakes, I speak Spanish mainly.