In a previous patch note it says "- Moves like Role Play or Trace no longer keep the temporary ability they gain."

But I tested it out yesterday with my alakazam synch and when I used Role Play the ability gained stayed the same one i copied (water absorb alakazam lol).

 

Confirmed as well it was not a visual bug since too many synchs failed (0 same nature out of 15 pokemons, extremely unlikely with 50% chance).

 

Returned fine when I copied a natu synch ability, but the move Role Play doesn't work properly.

If you go to a pc and heal the pokemon it returns the ability to it's original status

Tried that as well, healing the pokemon in the pokemon center didn't work

Moreover I think it should return to the original ability after the battle, this way being useful in scouting abilities of pokemons.

Huh that's odd, worked fine for me. Also yea I agree it would be must better if it did change back after a battle.