They aren't unbeatable, should continue to function normally.
The fact that you said it's unbeatable makes you invalid in this topic. Nothing is unbeatable. As for Buffs that are high level. I say they should be able to have a chance at being sealed as it's more fair for players who can't receive these OP buffs. For players who both have epic buffs on, in a pvp, it's still fair. Being able to SB or leech is a different story and shouldn't be allowed.