Scholar weapon bug?

Time: Since patch 2.1
Frequency: Always when I'm in a duty
World name: Leviathan
Character name: Vampilla Draculesti
NPC name: N/A
Monster name: It happens on every monster in duties
Class/level: Arcanist (Scholar) / 50
Party or solo: Party, 4 people and 8 people its in different duties
Race: Lalafel F
In-game time: N/A
Area and coordinates: In every duty I've tried so far.
Steps:
When I'm in combat in duties my character (scholar) puts away its weapon immediately after casting spells, the book just disappears and my character puts its hands down like I'm out of combat. The book is still visible at my side, but it should remain in my hands during combat.