The bug
When the ender dragon dies, as the body disappears, the purple beams start to fade away, but then brightly flash for a moment. This didn't occur in 1.8.1.
How to reproduce
Video demonstrating the issue: https://www.youtube.com/watch?v=jXr8ojqNoKw
Linked issues
Comments
yes i know im bad at english im dutch XD
Please do not mark unreleased versions as affected.
You don't have access to them yet.
Confirmed for 1.13.1.
Please do not mark unreleased versions as affected.
You don't have access to them yet.

Can this still be reproduced in 1.16-pre3?
No, @unknown. I was unable to reproduce this in 1.16-pre3.

Can confirm that this is fixed.
Confirmed in 1.8.3. To clarify the post, when the enderdragon dies, as the body disappears, the purple beams start to fade away, but then brightly flash for a moment. This didn't occur in 1.8.1.