FlashList inside scroll makes nested scroll, if you need to implement two FlashList with same direction you should try it makes unbounded layout case render all list item at onLoad, you should try

1. Join both data in array and render with one FlashList, FlashList Doc: If your list has heterogenous views, pass their types to FlashList using getItemType prop to improve performance.
2. Make one small list through array mapping in {ListFooter, ListHeader}Component as per your need.

Follow any one from above example if you face any issue leave comment, I will help you to fix.