Edit view fails within try block and goes straight to return with no error

I'm struggling to build an edit CRUD view in Flask. I have the add and list view working fine:

@main_blueprint.route('/', methods=['GET', 'POST'])
def all_items():
    all_user_items = Items.query.filter_by()
    return render_template('main/items.html', items=all_user_items)

@main_blueprint.route('/add', methods=['GET', 'POST'])
def add_item():
    form = ItemsForm(request.form)
    if request.method == 'POST':
        if form.validate_on_submit():
            try:
                new_item = Items(form.name.data, form.notes.data)
                db.session.add(new_item)
                db.session.commit()
                flash('Item added', 'success')
                return redirect(url_for('main.all_items'))
            except:
                db.session.rollback()
                flash('Something went wrong', 'danger')
    return render_template('main/add.html', form=form)

But when designing the edit item view, it simply reroutes me back to the list view.

@main_blueprint.route('/edit_item/<items_id>', methods=['GET', 'POST'])
def edit_item(items_id):
    form = EditItemsForm(request.form)
    if request.method == 'POST':
        if form.validate_on_submit():
            try:
                item = Items.query.get(items_id)
                item.name = form.name.data
                item.notes = form.notes.data
                db.session.commit()
                flash('Item edited successfully!', 'success')
                return redirect(url_for('main.all_items'))
            except:
                db.session.rollback()
                flash('Unable to edit item', 'danger')
        return render_template('edit_item.html', item=item, form=form)
    else:
        flash('Something went wrong', 'danger')
    return redirect(url_for('main.all_items'))

The log doesn't give any clues either even though I have full debug

 127.0.0.1 - - [14/Aug/2022 10:32:29] "GET / HTTP/1.1" 200 -
 127.0.0.1 - - [14/Aug/2022 10:32:29] "GET /static/images/favicon.png HTTP/1.1" 404 -

Based on previous conversations, it sounds like it is failing within the TRY block and going straight to the last line. Code in context is here:

https://github.com/hiven/FlaskApp/blob/d9fce1b123f38aabbc48c63659a880a58b2fe44e/app/main/views.py

from Edit view fails within try block and goes straight to return with no error