Please can my colleagues remind me; if a boat is attached to a starting mark then the boat becomes part of the mark - is this correct?

I recall a while back a lot of discussion regarding a small boat attached at the back of a RCV intended to protect the vessel. Some interpretations were that is was a temporary attachment and therefore not part of the mark. Though others said that if the attachment was intentional it was part of the mark.

I had thought we had formalised those discussions into official Q&A and then into a Case. Though looking at the Case Book I can’t find a reference.

Any help very much appreciated - thanks.