This sounds ominous, but perhaps an obvious positive feedback due to temperatures and other causes.
https://www.theguardian.com/environment/2024/oct/14/nature-carbon-sink-collapse-global-heating-models-emissions-targets-evidence-aoe
This is one of the reasons that talk of deferring action on climate change, kicking the can down the road, letting the market sort things out at a more appropriate time, etc is so wrong.