Bikeshed is adding spaces around ins and del tags which makes things visually weird

Input:

<pre class="metadata">
Title: App History API
Shortname: app-history
Repository: WICG/app-history
Inline Github Issues: true
Group: WICG
Status: CG-DRAFT
Level: 1
URL: https://wicg.github.io/app-history/
Boilerplate: omit conformance, omit feedback-header
Editor: Domenic Denicola, Google https://www.google.com/, d@domenic.me, https://domenic.me/
Abstract: The app history API provides a web application-focused way of managing same-origin same-frame history entries and navigations.
!Participate: <a href="https://github.com/WICG/app-history">GitHub WICG/app-history</a> (<a href="https://github.com/WICG/app-history/issues/new">new issue</a>, <a href="https://github.com/WICG/app-history/issues?state=open">open issues</a>)
!Commits: <a href="https://github.com/WICG/app-history/commits/master/spec.bs">GitHub spec.bs commits</a>
Complain About: accidental-2119 yes, missing-example-ids yes
Indent: 2
Default Biblio Status: current
Markup Shorthands: markdown yes
Assume Explicit For: yes
</pre>

<blockquote>
  When the user navigates through a [=browsing context=], e.g. using a browser's back and forward buttons, the user agent must <a spec="HTML">traverse the history by a delta</a> with a delta equivalent to the action specified by the user<del> and</del><ins>,</ins> the browsing context being operated on<ins>, and <i>[=traverse the history by a delta/isUserInitiated=]</i> set to true</ins>.
</blockquote>

Relevant portion of the output:

  <main>
   <blockquote>
     When the user navigates through a <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/browsers.html#browsing-context" id="ref-for-browsing-context">browsing context</a>, e.g. using a browser’s back and forward buttons, the user agent must <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/history.html#traverse-the-history-by-a-delta" id="ref-for-traverse-the-history-by-a-delta">traverse the history by a delta</a> with a delta equivalent to the action specified by the user
    <del> and</del>
    <ins>,</ins>
     the browsing context being operated on
    <ins>, and <i><a data-link-type="dfn">isUserInitiated</a></i> set to true</ins>
    . 
   </blockquote>
  </main>

Note the bad spaces it added around the ins and del tags.

Reproduce the issue with the supplied Bikeshed metadata and blockquote input, then compare the generated HTML shown in the report. Trace the whitespace handling around the ins and del elements. Done means the output no longer adds visually significant spaces or line breaks around those tags.