When you feed an animal like cow for example then leaving the area and stay it unloaded the time for them to like breed again doesn't work. You need to stay in the chunk for it to let the 20 minutes of the animal to breed again. 1.16.2 is a buggy version which led me to downgrade. I am using vanilla version. I would post a screenshot but there are nothing much you can see but I can if you would. This needs to be fixed for the early game survival