bootstrap.native: Hiding in Modal-events breaks Modal

There is some problem when calling Modal.hide() in the event-listener at least for shown.bs.modal and the Modal is already hidden.

var overwritten = {};
function showModal(modal, notimer) {
    overwritten[modal] = notimer || false;
    if (!modal.Modal) {
        new Modal(modal);
        modal.addEventListener('hide.bs.modal', function (evt) {
            overwritten[modal] = true;
        });
        modal.addEventListener('shown.bs.modal', function (evt) {
            setTimeout(function () {
                if (!overwritten[modal]) {
                    modal.Modal.hide();
                }
            }, 1500);
        });
    }
    modal.Modal.show();
}

Without the workaround with overwritten and the additional event listener for hide.bs.modal, at the next Modal.show(), the dialog shows up very short and will disappear immediately and the body-class stays set. So the UI is broken, because half of the Modal is left and you can not close the Modal anymore. This happens when the Modal got hidden by some other call (e.g. escape key) before and the timeout-function is running and calling Modal.hide() afterwards. There are no JS errors in console. I’ve no tested if the problem is with hiding a hidden Modal or with the timeout-event or both in combination.