Put the summary of the bug you're having here

Villagers that have all 8 stacks of their inventory full of seeds are still able to produce bread. they are setup farming wheat. for a few minutes, the wheat when farmed will stay on the ground. but after 5-10 minutes of working they start dropping bread. i believe it may be due to the change  you guys added where they put seeds into a composter, emptying their inventories of seeds, causing them to break the farm

What I expected to happen was...:

villagers should not create bread when their inventory is full, and it should stay full of seeds

What actually happened was...:
they are able to make bread, and put their seeds into a composter.

Steps to Reproduce:
1. Create a 9x9 enclosed area and make it farmland, with water in the middle

2. place a composter in the farm.

3. place a brand new villager (from a spawn egg, or from a villager breeder) into the farm. enclose him in blocks so you can drop the seeds at their feet.

4. drop 8 stacks of seeds at their feet. they will take all 8 stacks

5. till the soil and plant all 80 blocks with seeds.

6. either wait until the wheat grows or speed up tick speed until wheat are fully grown

7. set time to 2000

8. watch villagers harvest wheat. eventually the wheat will no longer stay at their feet when harvested, it will go into their inventory.

9. while they are harvesting, quite frequently they will go to their composter and deposit seeds, making bonemeal.