To my knowledge, this MP bug was fixed. Maybe it is in the main game, but it’s still happening in Reign of Terror.
Seems to be mainly related with cold/slowing auras. One of these is the holy freeze aura from paladin, a mod skill, but also with Windborne greaves proc, an untouched GD item/skill.
Is this issue fixed or am I misremembering? If it is, is this fixable in the mod?