[wp-trac] [WordPress Trac] #50905: Bug of both classic editor plugin and Featured image after update to 5.5

[WordPress Trac]

#50905: Bug of both classic editor plugin and Featured image after update to 5.5
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 Reporter:  christelleneant          |       Owner:  (none)
     Type:  defect (bug)             |      Status:  new
 Priority:  normal                   |   Milestone:  5.5.1
Component:  Editor                   |     Version:  5.5
 Severity:  critical                 |  Resolution:
 Keywords:  close reporter-feedback  |     Focuses:
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Changes (by SergeyBiryukov):

 * keywords:   => close reporter-feedback


Comment:

 Hi there, welcome to Trac! Thanks for the report. Just noting that I could
 not reproduce the issue on a clean install.

 I'm sorry to hear you are having issues with your website since the latest
 update, but this topic is best discussed on the
 [https://wordpress.org/support/ support forums] or directly with the
 developer of your theme or website.

 Before heading there to create a post though, I recommend reading through
 the following list of potential issues with 5.5:
 https://wordpress.org/support/topic/read-this-first-wordpress-5-5-master-
 list/

 The most likely issue is that a plugin on your site is running old
 JavaScript code. As suggested above, could you try installing and
 activating this plugin: https://wordpress.org/plugins/enable-jquery-
 migrate-helper/.

 This will confirm that there is JavaScript on your site that needs to be
 updated to follow more modern jQuery practices. You can leave the plugin
 active for the time being, but the breaking code will need to be updated
 before the next step of the Upgrading jQuery in Core roadmap.

 If this does not fix the issue, feel free to create a support topic.

-- 
Ticket URL: <https://core.trac.wordpress.org/ticket/50905#comment:5>
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