Sheep don't eat and don't regrow their wool

I'm playing a self-hosted Win10 game using the "Fish and Sheeps" world template by Netherpixel.  I have been playing this world only a couple of days.   

Yesterday when I started Minecraft it updated to 1.16.  Ever since my sheep don't eat and so their wool (or this case other resources like cobblestone) doesn't regrow.   This completely breaks this world!  I can only get more cobblestone or dirt, etc by breeding new sheep and waiting for the children to grow up, then I get to shear them once and after that they never regrow.

The sheep are free range, about 20 of them roaming a 13x13 pen.  You can see in the picture that none of the grass has been eaten.  The few unshorn sheep you see are children that just grew up and have never been shorn. This picture was taken after a few of hours of gameplay after the update to 1.16  It took me a while to notice that the sheep were not eating...