prefixes cannot be changed BUG!!!

I decide to craft Shields using Elder item which got

+109 to maximum Life
+8% increased maximum Life

as prefix. I use 2 EX to make prefixes cannot be changed on suffix.
Then use Deafening Essence of Scorn to 100% roll

(110–119)% increased Critical Strike Chance for Spells

on suffix. But after that +8% increased maximum Life turn in to

+30 to maximum Mana

GM please turn it into the right thing.

Essences and fossils ignore master mods. Working as intended.