[wp-trac] [WordPress Trac] #46906: When 'fr' is in the additional CSS area, WordPress shows error.

[WordPress Trac]

#46906: When 'fr' is in the additional CSS area, WordPress shows error.
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 Reporter:  mrgarry05                    |       Owner:  (none)
     Type:  defect (bug)                 |      Status:  assigned
 Priority:  normal                       |   Milestone:  Awaiting Review
Component:  Customize                    |     Version:  5.1.1
 Severity:  normal                       |  Resolution:
 Keywords:  has-screenshots needs-patch  |     Focuses:  administration
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Comment (by birgire):

 At first I thought this was related to #46597,

 but according to #41874 it seems that {{{safecss_filter_attr()}}} is not
 yet involved here.

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Ticket URL: <https://core.trac.wordpress.org/ticket/46906#comment:2>
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