[wp-trac] [WordPress Trac] #54320: There are no more thumbnails for uploaded PDFs

[WordPress Trac]

#54320: There are no more thumbnails for uploaded PDFs
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 Reporter:  10rjulienk21  |      Owner:  (none)
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  Awaiting Review
Component:  General       |    Version:  5.8.1
 Severity:  normal        |   Keywords:
  Focuses:                |
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 My current WP configuration
 • PHP / MySQL version: 7.4
 • Theme used: Camp Maine of TAM’S TRADING POST (no longer maintained)
 • Extensions in place: activated: Akismet - BackWPup - contact Form 7 -
 Cookie Notice - Honeypot for Contact Form 7 - Ithemes Security - Post Type
 Switcher - SF Move Login - TablePress - WP Image Zoom - WP Maintenance
 Mode.
 Name of the host: OVH
 Site address: https://amapdlacrau.fr
 Problems encountered:
 The latest .PDF files uploaded to the media library have a generic file
 icon and no longer display the small thumbnail unlike older files.
 Clicking on the icon no longer opens the image of the 1st page of the
 file.
 Everything I did that didn't work to fix the problem:
 * Create PDFs with different tools; Microsoft, Do PDF, ApowerPDF ...
 * Install WordPress version 5.8.1
 * Downgrading the PHP version from PHP 8 to PHP 7.4 This fixed the problem
 with the imagik module, declared absent by the site health check in
 version 8, but not the thumbnail problem.
 * Use an upload plugin: File Manager
 * Use thumbnail regeneration plugins: Regenerate Thumbnails and Force
 Regenerate Thumbnails.
 I have not tested: use a media management plugin instead of the media
 library
 I note that the function for generating the thumbnails of the PDF files
 has stopped working when the theme is no longer maintained and the PHP
 version is the same. Only the version of WordPress has changed

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Ticket URL: <https://core.trac.wordpress.org/ticket/54320>
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