Why is Golden Rice illegal?

Why exactly is Golden Rice considered illegal? I'm really puzzled by this matter. It's supposedly a genetically modified rice strain that aims to alleviate vitamin A deficiency in developing countries. Shouldn't such a beneficial innovation be welcomed and encouraged? Could you please elaborate on the reasons behind its illegality? Is it due to concerns over its safety, ethical issues, or something else entirely? I'm keen to understand the rationale behind this ban. Could you help me make sense of this apparent paradox?