The problem is with the incentives. We reward organizations for planting trees when we should be rewarding them for growing trees. Anecdotally, paper mills don't seem to have a problem successfully growing monocrop forests on their own properties because they actually have a reason to care about the success of replanting their own land.
This summer a Dutch tree-planting company accidentally started a fire in Spain that burnt a much wider surface of forest than what they had planted. As a local major put it: "they were going to plant 200 hectares and ended up burning 1,000 hectares covered with 50-year old pine trees".
https://www.heraldo.es/noticias/aragon/huesca/2022/07/20/los... https://www.theguardian.com/world/2022/jul/22/reforestation-... https://landlifecompany.com/news/land-life-statement-july-21...
I wouldn't be surprised if, from the point of view of carbon taxes, the saplings that were burnt in the fire were accounted as having offset carbon emissions just as much if they had lived a full life. Presumably, the new saplings that will be planted on their ashes will be accounted by the same amount.