But I think that mirror chloroplast, that make mirror (beta) sugar inside regular planet cells can be a good way to fix carbon, without any way to free the co2 back besides fire.
What's the danger in that?
A good example of the risks of mirror chirality is thalidomide - thalidomide has two enantiomers (one that provides sedative and anti-nausea effects and another that causes the infamous thalidomide birth defects) which the human body naturally flip-flops when administered.
The risk to reward ratio is negatively misaligned (edited) when factoring the catastrophic risks and how easy it would be to weaponize (either on purpose or inadvertently).