Researchers have made significant progress in the development of Permutation-Invariant (PI) quantum error-correcting codes, which can encode a logical qudit of dimension $\mathrm{d}_\mathrm{L}$ in PI states using physical qudits of dimension $\mathrm{d}_\mathrm{P}$. By extending the Knill--Laflamme (KL) conditions for $d-1$ deletion errors from qubits to qudits, they have investigated numerically both qubit and qudit constructions1. This extension enables the creation of more robust quantum error-correcting codes, capable of withstanding a wider range of errors. The study's findings have important implications for the development of reliable quantum computing systems, as they provide a foundation for constructing more efficient and resilient quantum error-correcting codes. This matters to quantum computing practitioners because it brings them closer to building large-scale quantum systems that can maintain quantum coherence and withstand errors, a crucial step towards realizing the full potential of quantum computing.