1. Summon a new skeleton.
2. Use a Flint and Steel to burn the skeleton or let the skeleton burn under the sun. 
3. Walk to the front of the skeleton and fly until you can see the skeleton. 
4. The fire on the skeleton is not visible. ( Observed Behaviour )

The screenshot shows a skeleton burning and getting hurt behind me but I can't see the fire. 

( May I ask you how do you know that the issues are duplicated? )