Forked Tower: Magic (Extreme) not giving rewards for completion

Date & Time: 29.07 - 31.07
Frequency: constant.
World name: Zodiark
Character name: Midnight Eagle
Retainer name: N/A
NPC name: N/A
Monster name: Index
Class/Level: DRK 100
Party or solo: Party
In-game time: around 7ST.
Area and coordinates: Forked Tower: Magic (Extreme), last boss arena.
Housing: Empyreum

Steps:
1. Clear the last boss of Forked Tower (Extreme), Index
2. Notice the lack of given rewards for completion: no job experience, no tomes, no silver, no gold given for killing the boss or opening the chest with the loot after. These rewards are given for completing Normal Mode, but the lack of them in Extreme feels like an oversight or a bug.

Connection Specs
- Type of internet connection/provider: ISP
- Modem maker/model number: unknown