Cold / Lightning Infusion + Heralds Bug

When using Cold Infusion with Herald of Ice, the DPS tooltip shows that the base attack gains 25% of damage as extra cold damage, but doesn't show the '50% less Fire and Lightning damage'; similarly, when using Lightning Infusion with Herald of Thunder, the attack gains 25% of damage as extra lightning damage, but doesn't lose fire and cold damage.

Supporting base attack directly with Cold / Lightning Infusion works as expected.

Using Cold Infusion with Herald of Thunder or Lightning Infusion with Herald of Ice has no effect on the base attack. Is this intended?

Hello,
Just learn this interaction today on a stream.
This is, to my eyes, clearly a bug. The bonus damage with triple herald (with their respectiv infusion) seems way too strong (if not broken).

Heralds are also applying flat damage that is not listed in the skill. After double checking its the same flat damage that would be added in the PoE 1 version of the skill. The PoE 2 version appears to add the flat damage from your armour as well on the first herald activated.