[wp-trac] [WordPress Trac] #43113: Multiple custom item classes are returned as single string when using 'nav_menu_link_attributes' filter with Customizer preview

[WordPress Trac]

#43113: Multiple custom item classes are returned as single string when using
'nav_menu_link_attributes' filter with Customizer preview
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 Reporter:  lrdn          |       Owner:
     Type:  defect (bug)  |      Status:  new
 Priority:  normal        |   Milestone:  Awaiting Review
Component:  Customize     |     Version:  4.9.2
 Severity:  normal        |  Resolution:
 Keywords:                |     Focuses:
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Comment (by westonruter):

 Do you have an example of some code causes the bug to appear?

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Ticket URL: <https://core.trac.wordpress.org/ticket/43113#comment:1>
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