I just played Rhythm of the Wild, followed by Angel of Grace.
Rhythm of the wild triggered, giving Angel of Grace Riot, but then +1+1 was automatically selected as the Riot effect; I was not given the choice to give it haste instead.
Later in the game I played a Sundering Titan, and again, it was given +1+1 automatically by the Riot effect.
Later in the game, I played a second, and then a third, Sundering Titan. On both occasions I was able to choose which effect I wanted for Riot.
Later in the game, I filled a Druid of Horns with mana, but already had 3 creatures in play. I was asked which Riot effect i wanted to give it, even though I chose not to play the creature.
Similar issues to the initial thread
https://forums.505go.com/discussion/77747/rhythm-of-the-wild-and-fetched-creatures#latest