I've come across these sentence written by English novelists by googling. (I've confirmed that they're English native speakers by googling their names)
After a while, finding that nothing more happened, she decided going into the garden at once.
I decided going into my white room.
But I've already learnt that when I want to use "decide" with "gerund", I must write it with "on" as in "I decided on going into my white house", but as I don't think this seems to be not entirely correct as I've come across exceptions to this, I wouldn't think they might've written grammatically incorrect sentences as they're experts at writing books.