The discovery of Pāṇinian grammar by nineteenth-century European linguistic scholars https://en.wikipedia.org/wiki/P%C4%81%E1%B9%87ini#Modern_linguistics https:

The discovery of Pāṇinian grammar by nineteenth-century European linguistic scholars https://en.wikipedia.org/wiki/P%C4%81%E1%B9%87ini#Modern_linguistics https://en.wikipedia.org/wiki/P%C4%81%E1%B9%87ini#Modern_lin... probably comes close, although of course Pāṇini was never lost or unknown in India.