[wp-trac] [WordPress Trac] #54558: Notice: Undefined index in WordPress 5.9 Beta

[WordPress Trac]

#54558: Notice: Undefined index in WordPress 5.9 Beta
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 Reporter:  kafleg                               |       Owner:  audrasjb
     Type:  defect (bug)                         |      Status:  reviewing
 Priority:  normal                               |   Milestone:  5.9
Component:  Editor                               |     Version:  trunk
 Severity:  normal                               |  Resolution:
 Keywords:  has-patch needs-testing has-unit-    |     Focuses:
  tests                                          |
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Comment (by Boniu91):

 == Test Report

  === Env
  * WordPress 5.0.14 and 5.9-beta1
  * Ubuntu 20.04.2 LTS server
  * Theme: Twenty Twenty One
  * Plugin: WP Downgrade | Beta Tester

  === Steps to test
 1. Navigate to Appearance > Editor.
 2. Clear your debug.log file.
 3. Navigate to Template Parts.

 No error in debug.log nor on the frontend.

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Ticket URL: <https://core.trac.wordpress.org/ticket/54558#comment:12>
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