[wp-trac] [WordPress Trac] #34674: Failure updating excerpts when a plugin is using get_the_excerpt() function

[WordPress Trac]

#34674: Failure updating excerpts when a plugin is using get_the_excerpt() function
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 Reporter:  dartiss            |      Owner:
     Type:  defect (bug)       |     Status:  new
 Priority:  normal             |  Milestone:  Awaiting Review
Component:  Posts, Post Types  |    Version:  trunk
 Severity:  normal             |   Keywords:
  Focuses:                     |
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 Apologies if this isn't an actual bug but I can't see any reference to
 this anywhere and not sure what else to look at.

 I've authored the plugin YouTube Embed. With version 4.0 I used
 get_the_excerpt() to get information for video metadata. However, upon
 release I heard from a number of users who were finding it was causing
 other plugins to crash - e.g. Jetpack Social and Add to Any.

 I found that by simply removing the above function call it would rectify
 the issue. However, I'm unable to understand why.

 The plugins with issues all have one thing in common - they're modifying
 the excerpt. So why would a read of the excerpt data then cause these to
 crash in some way? I tested specifically with Add to Any and no errors
 were output but, equally, it would not output the share icons for any post
 that called the get_the_excerpt function. However, it would work on any
 other post that didn't call my plugin.

 So, I'm left with a dilemma as I don't believe my plugin is doing anything
 illegal and is simply calling, within a post, a valid WordPress function.
 So why would it then have such an effect on other plugins?

 Any thoughts/suggestions on this would be greatly appreciated.

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Ticket URL: <https://core.trac.wordpress.org/ticket/34674>
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