Here is a command to see the bug in action:
/give @p minecraft:stone 1 0 {AttributeModifiers:[{Operation:0,UUIDLeast:1,UUIDMost:1,Amount:1000,AttributeName:generic.attackDamage,Name:Stone}],display:{Name:"Stone"}}
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Same issue at MC-64382
Slightly different bug. In that one the death is by an ender crystal explosion and it is still healing the dragon as it is dying.
No, here is the description of that report:
When an Ender Dragon dies because of the explosion of a healing Ender Crystal, the healing animation will still stay until the Ender Dragon is "gone".
Here are two screenshots for evidence.