Non-english slug can sometimes cause an error in WordPress query

[panjmp]

The error is

Warning: vsprintf(): Too few arguments in wp-includes/wp-db.php on line 1397

I found the root cause that if the encoded slug contains the %f or %[0-9]f. it will be converted to capital F (wp-db.php:1359) and will not be properly escaped (wp-db.php:1361)

I found a ticket here #49140 but it has been closed.