Mine get chopped bannanas and blueberries every morning. Apples, peach, cucumbers with yogurt most afternoons. 12 hens lay 11-12 eggs a day like clockwork. Not a problem.
My girls LOVE watermelon. And cantalope. And I put blueberries on their yogart sometimes. Or sometimes I put grape jelly on it. They LOVE that. My girls aren't fond of bananas though.
I have a small orchard and as soon as I let the girls out of the run they bee line it right to all the windfalls under the apple trees. No problems for me either.
I have apple and pear trees. The chickens have eaten all season on what falls on the ground. Bushes of fruit. I'm getting plenty of eggs, with no problems noted. The LOVE the apples and pears!