Bug: The update from 1.5.2 to 1.6.0 is breaking

I'm submitting a bug report

Library Version:
1.6.0

Since the update to 1.6.0, some of my unittests(jest) in my project stopped working.

```
Loader must implement loadTemplate(url).
115 | });
116 |
> 117 | await component.create(bootstrap);
| ^
118 | });
129 |
at Loader.loadTemplate (node_modules/aurelia-loader/dist/commonjs/aurelia-loader.js:119:11)
at ensureRegistryEntry (node_modules/aurelia-templating/src/view-engine.ts:22:17)
at ViewEngine.Object..ViewEngine.loadViewFactory (node_modules/aurelia-templating/src/view-engine.ts:135:12)
at ConventionalViewStrategy.Object..ConventionalViewStrategy.loadViewFactory (node_modules/aurelia-templating/src/view-strategy.ts:133:23)
at HtmlBehaviorResource.Object..HtmlBehaviorResource.load (node_modules/aurelia-templating/src/html-behavior.ts:306:10)
at ResourceDescription.Object..ResourceDescription.load (node_modules/aurelia-templating/src/module-analyzer.ts:210:35)
at ResourceModule.Object..ResourceModule.load (node_modules/aurelia-templating/src/module-analyzer.ts:122:23)
at node_modules/aurelia-templating/src/view-engine.ts:288:41
```

Downgrading the version back to 1.5.2 fixes this issue!

Please tell us about your environment:
Operating System:
Linux (Ubuntu 18.04)

Node Version:
14.21.3

Expected/desired behavior:
Update should not contain breaking changes.

Start by reproducing the failing Jest unit tests with version 1.6.0 and compare them with 1.5.2. Read the stack trace through aurelia-loader and aurelia-templating, especially Loader.loadTemplate and ViewEngine.loadViewFactory; done means the affected tests pass on 1.6.0 without breaking the documented update behavior.

Written by the indexing model from the issue text.