If Nalanda was not destroyed by the Muslims, we would not doubt the origins of any of the translated sutra.
https://www.livehistoryindia.com/amazing-india/2020/05/24/nalanda
玄奘法师 went to India, and spent a few years studying in Nalanda, and he got a few cartload of sutras back.
https://www.firstpost.com/india/anc...ntity-is-waged-in-its-campuses-2-7874091.html
"In 1193, Bakhtiyar Khilji and his army of tall, swarthy Turkic marauders descended on Bihar’s Nalanda University. Thousands of Buddhist monks were burned alive, Brahmins beheaded, and 9 million precious manuscripts set on fire.
“Smoke from the burning manuscripts hung for days like a dark pall over the low hills,” wrote Persian historian of the times Minaj-i-Siraj in his book Tabaqat-I Nasiri."
https://en.wikipedia.org/wiki/Nalanda
Nalanda and the Tibetan Buddhist tradition
The last throne-holder of Nalanda, Shakyashri Bhadra of Kashmir,[90] fled to Tibet in 1204 at the invitation of the Tibetan translator Tropu Lotsawa (Khro-phu Lo-tsa-ba Byams-pa dpal).[91] Some of the surviving Nalanda books were taken by fleeing monks to Tibet.[92][93] He took with him several Indian masters: Sugataśrī, (an expert in Madhyamaka and Prajñāpāramitā); Jayadatta (Vinaya); Vibhūticandra (grammar and Abhidharma), Dānaśīla (logic), Saṅghaśrī (Candavyākaraṇa), Jīvagupta (books of Maitreya), Mahābodhi,(Bodhicaryāvatāra); and Kālacandra (Kālacakra).[94]
Tibetan Buddhist tradition is regarded to be a continuation of the Nalanda tradition. The Dalai Lama states:
Tibetan Buddhism is not an invention of the Tibetans. Rather, it is quite clear that it derives from the pure lineage of the tradition of the Nalanda Monastery. The master Nagarjuna hailed from this institution, as did many other important philosophers and logicians...
The Dalai Lama refers to himself as a follower of the lineage of the seventeen Nalanda masters.
An Astasahasrika Prajnaparamita Sutra manuscript preserved at the Tsethang monastery has superbly painted and well preserved wooden covers and 139 leaves. According to its colophon it was donated by the mother of the great pandita Sri Asoka in the second year of the reign of King Surapala, at the very end of the 11th century.
