UICollectionView footer inset cannot set to zero

Question

I'm trying to create a collectionview where the header and footer should have zero space to the cells

For some reason the footer insists on having 8 points spacing, any ideas are welcome.

    self.setsCollectionView.contentInset = UIEdgeInsets(top: 10, left: 10, bottom: 0, right: 10)

    self.setsCollectionView.register(supplementaryNib: SingleSetCollectionHeaderReusableView.self, type: .header)
    self.setsCollectionView.register(nib: SingleSetRepetitionCollectionViewCell.self)
    self.setsCollectionView.register(supplementaryNib: SingleSetCollectionFooterReusableView.self, type: .footer)
    
    self.setsCollectionView.refreshControl = UIRefreshControl()
    self.setsCollectionView.refreshControl?.addTarget(self, action: #selector(TrainingDashBoardViewController.refresh), for: .valueChanged)

    self.setCollectionViewLayout.estimatedItemSize = UICollectionViewFlowLayout.automaticSize
    self.setCollectionViewLayout.scrollDirection = .vertical
    self.setCollectionViewLayout.sectionInset = .zero
    self.setCollectionViewLayout.minimumInteritemSpacing = 0
    self.setCollectionViewLayout.minimumLineSpacing = 0


func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, insetForSectionAt section: Int) -> UIEdgeInsets {
        return .zero
    }

func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, referenceSizeForHeaderInSection section: Int) -> CGSize {
    let width = collectionView.frame.width - (collectionView.contentInset.left + collectionView.contentInset.right)
    return CGSize(width: width, height: 44)
}

func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, referenceSizeForFooterInSection section: Int) -> CGSize {
    let width = collectionView.frame.width - (collectionView.contentInset.left + collectionView.contentInset.right)
    if #available(iOS 15.0, *) {
        guard let set = self.dataSource.sectionIdentifier(for: section) else { return .zero }
        return CGSize(width: width, height: set.repetitions.isEmpty ? 56 : 44 )
    } else {
        return CGSize(width: width, height: 44)
    }
}