onConflictDoNothing is not returning values

const competition = await db
  .insert(competitions)
  .values({
    name: data.competition,
  })
  .onConflictDoNothing()
  .returning();

const competition = await db
  .insert(competitions)
  .values({
    name: data.competition,
  })
  .onConflictDoNothing()
  .returning();