Using pipes – can’t get post data

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Hello,
Since updating from 5.2 to 5.3, the post data for a field that has pipes returns an array rather than its value.
I’m trying to use the “wpcf7_before_send_mail” hook for a custom function.
It was working previously and if I rollback to version 5.2 it works again.
Can you please guide me as to how I can get the value in the latest update or is this a bug?