After converting a world from the xbox one edition over to bedrock, you are unable to shear a adult sheep with wool. Unless they eat grass (and the values get updated), then you will be able to shear the sheep.
Steps to reproduce:
Convert a world with adult sheeps with wool from the console edition.
Don't let them eat grass.
You can't shear the sheep.
If you let them eat grass, although they had wool already, suddenly they can be sheared.
One of many little test