Moving form errors in Symfony 4 form label to below input.

bootstrap_4_horizontal_layout_fix.html.twig

{% extends 'bootstrap_4_horizontal_layout.html.twig' %}

{% block form_label_errors %}{% endblock %}

{% block form_row -%}
    {%- if expanded is defined and expanded -%}
        {{ block('fieldset_form_row') }}
    {%- else -%}
        <div class="form-group row{% if (not compound or force_error|default(false)) and not valid %} is-invalid{% endif %}">
            {{- form_label(form) -}}
            <div class="{{ block('form_group_class') }}">
                {{- form_widget(form) -}}
                {{- form_errors(form) -}}
                {{- form_help(form) -}}
            </div>
        </div>
    {%- endif -%}
{%- endblock form_row %}

bootstrap_4_layout_fix.html.twig

{% extends 'bootstrap_4_layout.html.twig' %}

{% block form_label_errors %}{% endblock %}

{% block form_row -%}
    {%- if compound is defined and compound -%}
        {%- set element = 'fieldset' -%}
    {%- endif -%}
    {%- set widget_attr = {} -%}
    {%- if help is not empty -%}
        {%- set widget_attr = {attr: {'aria-describedby': id ~"_help"}} -%}
    {%- endif -%}
    <{{ element|default('div') }} class="form-group">
        {{- form_label(form) -}}
        {{- form_widget(form, widget_attr) -}}
        {{- form_errors(form) -}}
        {{- form_help(form) -}}
    </{{ element|default('div') }}>
{%- endblock form_row %}