When I went through the portal the Ender Dragon left on his death to return to the overworld, the potion effects I had were gone.
Steps to reproduce:
-Go to the end.
-Kill the dragon if it's not dead.
-Get potion effects, either by potions or by the /effect command.
-Check by the inventory key you still have them.
-Pass through the portal the ender dragon left on his death.
-Press the inventory key and you'll see you have no potion effects.
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Well the original version says invisibility is lost, it specifies the potion effect, so I didn't even know. Well, you get more info about it 😉, hope that bug is fixed before 1.5.1 is released.

Updated summary of MC-3668
So it's obvious how to reproduce that bug, right?
Duplicate of MC-3668, please use the search function to see if your bug has already been submitted. Currently over 54% of tickets are being closed as duplicate.