[wp-trac] [WordPress Trac] #61347: Swapping templates hangs site

[WordPress Trac]

#61347: Swapping templates hangs site
--------------------------------+-----------------------------
 Reporter:  mattpettefer        |      Owner:  (none)
     Type:  defect (bug)        |     Status:  new
 Priority:  normal              |  Milestone:  Awaiting Review
Component:  Editor              |    Version:  6.5.3
 Severity:  normal              |   Keywords:  needs-patch
  Focuses:  template, rest-api  |
--------------------------------+-----------------------------
 After selecting a different template, the entire site hangs for over a
 minute with disabled update button before "Updating..." begins.

 There are no errors other than some assets being served over http rather
 than https from plugins. On the occasion that a template had a block
 error, the behavior was exactly the same as when there are no errors in
 the template. Same whether there is a template part in the template or
 not.

 Template example:

 <!-- wp:template-part {"slug":"header","tagName":"header", "className":
 "site-header2020"} /-->
 <!-- wp:group {"tagName":"main","layout":{"type":"constrained"}} --><main
 class="wp-block-group">

     <!-- wp:post-content {"className":"legacy-post-padding"} /-->

 </main><!-- /wp:group -->

 Theme.json snippet:

 "customTemplates": [
                 {
                         "name": "page-no-title",
                         "postTypes": ["page"],
                         "title": "Page No Title"
                 },
                 {
                         "name": "page-with-sidebar",
                         "postTypes": ["page"],
                         "title": "Page with Sidebar"
                 },
                 {
                         "name": "page-wide",
                         "postTypes": ["page"],
                         "title": "Page with Wide Image"
                 },
                 {
                         "name": "single-with-sidebar",
                         "postTypes": ["post"],
                         "title": "Single with Sidebar"
                 },
                 {
                         "name": "single-academic-pages-legacy",
                         "postTypes": ["academic-pages"],
                         "title": "Academics Pages Legacy Padding"
                 },
                 {
                         "name": "single-academic-pages-legacy-header",
                         "postTypes": ["academic-pages"],
                         "title": "Academics Pages Legacy Header"
                 },
                 {
                         "name": "single-academic-pages-w-title",
                         "postTypes": ["academic-pages"],
                         "title": "Academics Pages with Title - M.S."
                 }

         ]

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Ticket URL: <https://core.trac.wordpress.org/ticket/61347>
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