Description:
------------
Reproduced in PHP 7.3.9 and 7.3.10.
Reproduced on Mac OS 10.14.6 and Debian 4.7.2-5.

This bug was not present in PHP 7.2.

Using a docx file generated from Google Drive. This issue is not present with docx files from MS Word.

finfo_file() does report the correct mime type for the file, but the string contains the mime type string twice.


Test script:
---------------
$file = __DIR__."/file-downloaded-from-google-drive.docx";
$finfo     = finfo_open( FILEINFO_MIME_TYPE );
$real_mime = finfo_file( $finfo, $file );
finfo_close( $finfo );
var_dump($real_mime);

Expected result:
----------------
finfo_file( $finfo, $file ) returning:
string(71) "application/vnd.openxmlformats-officedocument.wordprocessingml.document" 

Actual result:
--------------
finfo_file( $finfo, $file ) returning:
string(142) "application/vnd.openxmlformats-officedocument.wordprocessingml.documentapplication/vnd.openxmlformats-officedocument.wordprocessingml.document"