Eleventy problem

.eleventy.js

// !!!!! the next two functions do NOT break release.md !!!!!

  eleventyConfig.addCollection("tagList", collection => {
    const tagsSet = new Set();
    collection.getAll().forEach(item => {
      if (!item.data.tags) return;
      item.data.tags
        .filter(tag => !['post', 'all'].includes(tag))
        .forEach(tag => tagsSet.add(tag));
    });
    return Array.from(tagsSet).sort();
  });

  eleventyConfig.addCollection("pkgList", collection => {
    const pkgsSet = new Object;
    collection.getAll().forEach(item => {
      if (!item.data.package) return;
      if (pkgsSet[item.data.package]) return;
      pkgsSet[item.data.package] = {};
    })
//		for (val in pkgsSet) {
//	    pkgsSet[val] = {"pkg": val};
//	  };
    return pkgsSet;
  });

// !!!!! the next function BREAKS release.md !!!!!

  eleventyConfig.addCollection("testList", collection => {
    const testSet = new Object;
    collection.getFilteredByTags("release").forEach(item => {
      const data = item.data;
      if (!data.package) return;
      if (!testSet[data.package]) testSet[data.package] = new Object;
      testSet[data.package] = {...testSet[data.package], ...item.data};
    })
    return testSet;
  });

release dot md

---
title: Releases
layout: page
pagination:
  data: collections.release
  size: 50
  alias: posts
---
<section class="content-section bg-primary text-white small-section">
  <div class="container text-center">
    <div class="content-section-heading">
      <h2>Release Announcements</h2>
    </div>
  </div>
</section>

<section class="content-section bg-light small-section">
  <div class="container text-center">
    <div class="row">
      <div class="col-lg-10 mx-auto lead text-left">

<p>        {{ collections.tagList }}
<p>        {{ collections.pkgList }}
<p>        {{ collections.testList }}

        <h2>Stable</h2>
        {%- for post in collections.stableReleaseNotes -%}
	        <h3 class="release-heading"><a href="{{ post.url | url }}">{{ post.data.title }}</a></h3>{{ post.date | dateString }} 
	        | <strong>{{ post.data.package }}</strong>
	        | {{ post.data.version }}
	        | {{ post.data.tags }}
				{%- endfor -%}
        <h2>Unstable</h2>
        {%- for post in collections.unstableReleaseNotes -%}
	        <h3 class="release-heading"><a href="{{ post.url | url }}">{{ post.data.title }}</a></h3>{{ post.date | dateString }} 
	        | <strong>{{ post.data.package }}</strong>
	        | {{ post.data.version }}
	        | {{ post.data.tags }}
				{%- endfor -%}
        <h3>Latest Releases</h3>
        {%- for release in collections.latestReleases -%}
          <h4>{{ release[0] }}</h4>
          {%- for type in release[1] -%}
        		<p>{{ type[1].version }} {{ type[0] }}</p>
					{%- endfor -%}
				{%- endfor -%}
<hr>
<p>        {{ collections.packageList }}
<p>        {{ collections.latestReleases }}
		  </div>
		</div>
	</div> 
</section>