@Vitor Pamplona what kind are you using for bookmarks? Did you move to the new kind?
Kind 30001
yep, but I dont think Bookmarks should be a NIP-51 List. The user either doesnt care about bookmarks and it is always empty or they care and it grows too fast and just becomes unmaintainable. I think unbound lists or NIP-32 labels are better suited to avoid putting 10,000 events in a single list.