T3 phase 2 boss of chaos dungeon bugged or...?

I only noticed this happening this time, so I’m not sure if it has been happening this whole time I’ve been in T3, but the final boss of T3 chaos dungeon (1325 one) only gave me EXP and silver just now.

So far I noticed it was always the named creatures and the boss giving the most materials on death, but this time this happened and I kind of found it ridiculous or maybe just it was just unlucky?

Can anyone tell me if it’s just bad rng or should it actually have rewarded materials?

Thank you in advance.