Frozen Orb dont affected from items

Arcane orb with rune Frozen orb works incorrect?

Area shreds with ice bolts do not recieve damage buff by items, only area of explosion

So Triumvirate sphere (and other buffs on Arcane orb) not affect line damage of skill, only end point

Its a bug?

There is a video about (ru lang)
“Diablo III 2020 03 16 04 58 49 01 - YouTube”