First of, I am not sure this is a problem in Jaikoz.
In the 3.x versions when I did a manual correct metadata from musicbrainz tracks either had or had not a checkmark in the Amplifind Id checkbox indicating an Amplifind Id match (or not).
In the 4.0.0. version all possible matches returned always seem to have the Amplifind Id checkmark.
Of course now the same recording can be linked to many releases, its possible that all the releases you see are for the same recording, and this one recoridng does have a PUID.
I’ll have to check further.
Hi Paul,
That’s not it i’m afraid. I have yet to see a possible match that does not have an amplifind id match according to Jaikoz and during the weekend I have checked several hundred songs. Even different songs from different artist claim to have the match. This can of course be faults in the musicbrainz db but I suspect something is not going quite right here. 
You are correct, this is a consequence of changes in NGS, fixed for next release.