[wp-trac] [WordPress Trac] #41144: Previewing static front page drops custom page template

[WordPress Trac]

#41144: Previewing static front page drops custom page template
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 Reporter:  JBChristy     |       Owner:
     Type:  defect (bug)  |      Status:  closed
 Priority:  normal        |   Milestone:  Awaiting Review
Component:  Editor        |     Version:  4.8
 Severity:  normal        |  Resolution:  invalid
 Keywords:  close         |     Focuses:
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Changes (by JBChristy):

 * keywords:   => close
 * status:  new => closed
 * resolution:   => invalid


Comment:

 You are correct. The issue appears to be with our 3rd party plugin. I
 created a vanilla WordPress 4.8 site using TwentySeventeen. I created a
 trivial custom page template, and assigned it to the homepage (which is
 the default '''Sample Page'''). I was unable to reproduce the problem, no
 matter how many times I tried to edit and preview the page.

 I then installed and activated our 3rd party plugin. Once an autosave was
 created for my user for the homepage, I was able to reproduce the problem
 100% of the time. I deactivated that plugin, and was again unable to
 reproduce the problem.

 I see that that plugin has a `wp_creating_autosave` hook that copies the
 parent page's page template to the autosave. Although I've spent hours in
 the debugger, I cannot seem to find where or when the parent page's page
 template gets reset, but it seems to always happen after that hook fires,
 and never happen when the plugin is disabled.

 Anyway, I see that this is not an issue with WP core, so I'm marking this
 ticket `resolve as: invalid`.

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Ticket URL: <https://core.trac.wordpress.org/ticket/41144#comment:4>
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