if you spawn ,for example, a cow and name it 'daisy' with a nametag and then you do the command '/testfor @e[type=cow, name= daisy]' it will find the cow!
Now if you rename the spawnegg in an anvil and you spawn the cow with the named spawnegg and you do again the command '/testfor @e[type=cow, name= daisy]' it will not find the cow!!!

Plz fix this BUG because it will be helpful in command block machines!!!

Thank you Mojang Team,
nikoskon