[wp-trac] [WordPress Trac] #42573: Templates not working properly

[WordPress Trac]

#42573: Templates not working properly
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 Reporter:  precies       |       Owner:
     Type:  defect (bug)  |      Status:  reopened
 Priority:  high          |   Milestone:  4.9.1
Component:  Themes        |     Version:  4.9
 Severity:  normal        |  Resolution:
 Keywords:  needs-patch   |     Focuses:
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Comment (by don_alejandro):

 An issue I'm not seeing explicitly mentioned is that the 4.9 update
 effectively frelled live sites that are not under development and have not
 made recent template changes. Also, if the template cache is supposed to
 update every hour or so, I’ve not seen any evidence of that.

 I updated my sites several days ago and am now receiving emails about
 pages that were fine before updating to 4.9 – WordPress still has not
 gotten around to noticing the collection of page templates included in my
 parent theme.  For example, the 4.9 update failed to notice any of my
 parent theme page templates except for the 'default' template. Pages using
 the default template or a child theme template were fine, but any pages
 using one of the optional parent theme templates were reset to the
 'default' template. I couldn’t even fix the pages until after finding one
 of the custom plugins especially developed to clear this new cache.

 I'll be spending the rest of the day clearing the template cache on ten
 different websites and looking at pages to see which ones I need to
 manually reset them to use the proper template...

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Ticket URL: <https://core.trac.wordpress.org/ticket/42573#comment:71>
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