Hello,

I have tested all variables and confirmed this as a true BUG. Please see attached images.  Please escalate and address, thank you.  This is in the Greek Mythology Mash-up of the Nintendo Switch Bedrock Edition.  The seed is is -1264174916. 

I noticed early on in the game that random sheep in the world (all types, colors etc.) that randomly generated DID NOT regrow their wool after sheering.  I was able to collect the wool, but noticed over thousands of game days they didn't respawn.  Later, after creating fenced in farms at multiple places in the overworld, no sheep re-grew their wool regardless of having access to grass blocks.  Later, I created subterranean artificial farms, provided with plenty of grass that had been harvested by a pick using silk touch, and they never consumed the grass nor re-grew wool. 

Please note I have tested over long periods of time, and tried all options within the game menu including setting griefing to false as was a bug in a previous Java edition. 

Thank you for addressing.