This question has come up before and the answer we got from Encon was the following if I can recall it correctly.
When leaving Ct. waters and fishing in RI waters at that point it is RI fishery laws that prevail. But when you return home to Ct. waters then your possession catch must conform to Ct. fishery laws for both the Ct. in-transit and Ct. landings.
The only way this can be avoided is if your boat is trailered from Ct. territory into RI territory and launched at a RI boat launch. Your fishing should be restricted to RI waters and you load your boat onto your trailer, with your legal RI possession catch, at the RI boat launch and then proceed to trailer your rig and catch over land back into Ct. This basically follows the Inland Fisheries practices for cross-border trips from Ct. to other states for fishing freshwater destinations.
I think this is what is in effect for this situation now.