insert bug(CI4)

here I insert the follow data to mysql.

PHP Code:

$data['password']='$2y$10$ErQlCj/Mo10il.FthAm0WOjYdf3chZEGPFqaPzjqOX2aj2uYf5Ihq' 


when I check the database, the data was changed to

Code:

y\$ErQlCj/Mo10il.FthAm0WOjYdf3chZEGPFqaPzjqOX2aj2uYf5Ihq

please note "$2y$10" was changed to "y\" and the number of characters was changed too(from 60 to 56).

I guess this is might be a bug?

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