Template error supressed when it's included inside {% if %}

[arty-name]

I have a template with an error, i.e. like bad.html:

 {% fail %}some output

When I include this file I get a proper error message:

{% include './bad.html' %}

Template render error: (backend/src/views/test/include.html)
 Template render error: (backend/src/views/test/bad.html) [Line 1, Column 2]
 unknown block tag: fail

However when I include this file inside an {% if %} tag I get no error:

{% if true %}
{% include './bad.html' %}
{% endif %}

The included template just stops rendering at the point of failure, I see neither some output nor error message.