Trees not growing I was playing a creative world when I stumbled upon the trees not growing when bonemealed

Are you using any non-default game settings or add-ons other than switching to Creative mode? If so, what settings / add-ons are you using?

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That's a Dark Oak sapling. You need four of those saplings to grow a dark oak tree.

As mentioned in the previous comment, does it work if you use 4 saplings (in 2x2 arrangement)?
Does it work with other sapling types?