Divergent Herald of Thunder, Storm Secret and Boss procs

Raising awareness here - this bug seems to apply only to the Divergent Herald of Thunder (though I've not tried other Alternative Quality Heralds).

I can shock and storm any boss with a standard Herald of Thunder slotted - but when I move to my (21/23Q) Divergent Herald, no Herald procs happen at all.

For testing sake, I'm using 21/23 Herald of Thunder in the Crest of Desire (+8 Socketed), with +4 Global - totaling a 33/67Q Herald of Thunder. Also have equipped both a single Storm Secret as well as two - with the same result.

It does MORE than enough damage to shock bosses.

Help! Alternative Quality gem being nerfed by interactions between game mechanics!