[5.x]: Extending a non-existent template in an element partial doesn't show a helpful error message

[MoritzLost]

What happened?

Description

If you extend a template that doesn't exist in an element partial template, you get the fallback behaviour (e.g. Entry 123) instead of an exception view. That's because ElementHelper::renderElements() catches all errors of type TwigLoaderError to catch when an element partial doesn't exist, but that's the same error that's thrown when extending a template that doesn't exist.

I've opened a PR to fix this: #15177

Steps to reproduce

1. Create an element partial template, e.g. _partials/entry/home and inside, extend a non-existant template:

{% extends "path/to/missing/template" %}

2. Render an entry of that entry type: {{ entry.render() }}

Expected behavior

Every error in element partials should show regular exception views.

Actual behavior

The error is silently discarded and the fallback behaviour of showing a string representation is used.

Craft CMS version

5.1.10

PHP version

8.3

Operating system and version

No response

Database type and version

No response

Image driver and version

No response

Installed plugins and versions

[brandonkelly]

Thanks for the report and PR! Merged for the next release.

[brandonkelly]

Craft 5.2.0-beta.6 is out with that fix.