problem with argument passed from mapping to query

[cax21]

hi,
i'm using 1.4.0 connector in distributed mode.
the goal is to map one key from a json event to a 3 columns table along with uuid and timestamp
i have a connector config as per below:

topic.<name>.<keyspace>.<table>.mapping : "id=now(), et=value.event_time"
topic.<name>.<keyspace>.<table>.query = "INSERT INTO keyspace.table (id, ct, et) VALUES (:id, totimestamp(now()), :et)

it works fine.
but if I change the query to :

topic.<name>.<keyspace>.<table>.query = "INSERT INTO keyspace.table (id, ct, et) VALUES (:id, totimestamp((timeuuid):id), :et)

it fails saying "there is a bug in the connector, please report"
hence this issue,
see log in attached picture.