Cache does not refresh after template changes?

[bresam]

Hi @barryvdh and community

What I've done:
I've overridden/extended the bootstrap 4 template.
config/form.php

[
    'theme' => 'bootstrap_4_customization.html.twig',   
    'template_directories' => [  
        resource_path('views/form')   
]

resources/views/form/bootstrap_4_customization.html.twig

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

{% block form_row -%}
...

What's the question/issue:
Is it right that changes made at the template do not trigger a rebuild of the twig cached files?

Is there a way to configure such a cache rebuild or is this an issue?