I would imagine that EASA would have serious problems in the future insisting on a cut off date of the 8th April when the rating can still be issued onto a JAR licence up to 30th June, which will be an EASA licence when re-issued - can't see how they could make that stick. Doesn't give me anything to worry about to be honest.
The original advice about the 8th April was before the CAA clarification on dates.
But if the move is to push for retention, then it won't matter anyway.