There was no real interest in the pre-Conquest language and literature as distinct fields of study sadly. Much of the literature of Anglo-Saxon England was, well ignored doesn't quite accurately describe the situation truth be told.

The Exeter book is one of the main sources for surviving Old English literature and poetry. Its provenance after the conquest is well attested and it is one of the most complete and long lived surviving collections of old English literature. It was also used as a cutting board at one point, probably a coaster as well. This only adds onto the damage that naturally accumulated through wear and tear. Other Old English manuscripts likewise suffered from years of neglect and disinterest, the Lowell codex, the Junius Manuscript, and even the magnificent Lindisfarne Gospels stayed in monastic libraries, cathedral libraries, and private collections gathering dust for centuries before they received academic or even literary appreciation.

It was not later medievals either who were interested in these texts, but starting in the 16th century, antiquarians, who collected old works for the sake of doing so, and the progression from collection to research was also a long process. It was not until the 19th century that Old English texts and literature started to receive a greater deal of attention and scholarship. This was partly due to the waves of nationalism that were spreading across Europe at the time, and engulfed England no less. In the midst of romanticism and nationalism, a new found appreciation for the England before the Norman Conquest emerged, and this was the context that say the first learned and educated interest in the Anglo-Saxon literary corpus. This tradition of course continued into the 20th and now 21st centuries through the revival of Old English literary studies, as popularized by writers and scholars such as JRR Tolkien.

Now this does not mean that all Anglo-Saxon texts were subject to this discrimination. Anglo-Saxon legal texts did receive a good deal of attention in the post-conquest period and were recopied, translated, and possibly even used well into the Norman period. The Quadripartitus legal text, disseminated under Henry II, for example collected Latin translations of much older Old English law codes that extended long before the conquest. However these were not works of art or literature, but functional legal texts.