[wp-trac] [WordPress Trac] #52111: Classic Editor - TinyMCE Visual Page editor not working correctly after update to version 5.6, 5.6.1, & 5.6.2

[WordPress Trac]

#52111: Classic Editor - TinyMCE Visual Page editor not working correctly after
update to version 5.6, 5.6.1, & 5.6.2
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 Reporter:  spikeuk1      |       Owner:  (none)
     Type:  defect (bug)  |      Status:  new
 Priority:  normal        |   Milestone:  Future Release
Component:  Editor        |     Version:  5.6
 Severity:  major         |  Resolution:
 Keywords:                |     Focuses:
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Comment (by herrvigg):

 Not sure but this could explain the problem, asynchronous firing with
 jQuery3: https://github.com/jquery/jquery/issues/3194

 With jQuery3 `ready` handlers fire asynchronously and may be fired after
 `load`... there's no guarantee so that can explain some "random"
 behaviors.

 Long story short, the `load` trigger should never be set in the `ready`
 callback but outside. Ideally it should even be avoided when using ready.

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Ticket URL: <https://core.trac.wordpress.org/ticket/52111#comment:24>
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