[wp-trac] [WordPress Trac] #48698: Update fails if there’s a "Custom Html" block and an Iframe inside it

[WordPress Trac]

#48698: Update fails if there’s a "Custom Html" block and an Iframe inside it
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 Reporter:  ozgurnevres   |      Owner:  (none)
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  Awaiting Review
Component:  Editor        |    Version:  5.3
 Severity:  normal        |   Keywords:
  Focuses:                |
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 When creating a new post or updating an old post, If there's a "Custom
 Html" block with an Iframe inside it, save always fails - regardless of
 what's in that block.

 It gives the following error:
 Updating failed. Error message: The response is not a valid JSON response.

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Ticket URL: <https://core.trac.wordpress.org/ticket/48698>
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