Lit Form vs Lit Text

Lit Form vs Lit Text - We’re running into a challenge with Vega Discover where audiobooks aren’t showing up under the fiction/nonfiction facet. Vega relies on MARC 008 byte 33 (LitF) for this facet, but audiobooks use 008 bytes 30–31 (LTxt), which Vega doesn’t currently map. This means literary audiobooks—fiction, nonfiction, biography—aren’t included in the facet filtering. Has anyone found a workaround for this? Is there a way to incorporate LTxt values into the fiction/nonfiction facet logic or configure Vega to recognize them? We’d love input from anyone with cataloging experience or who’s tackled this issue in their own implementation. Example from our catalog: https://dcls.na5.iiivega.com/search?query=%22the%20shepherd%27s%20crown%22&searchType=everything&pageSize=10