Wooden houses will typically have a waterproof roof and some kind of treatment to prevent them rotting. A log that’s left outside will release all it’s carbon in much less than a century. Human intervention is needed for trees to achieve permanent carbon capture.

That wasn’t always the case, though. After trees evolved lignin, it took a while for fungi to evolve ligninase to digest it, so trees fell over and just got buried under more trees later without rotting, and that’s where a significant fraction of all coal came from.