I don't think they changed the loot table for this guy.
It's just RNG, hopefully.
Read the new patch notes!!!
In Campaign Mode, Manglemaw now only drops loot and gives XP before the player progresses to the Chancellor's Tomb quest
In other news: Feast your eyes on this
===== Misc Statistics =====
Total tracking time: 0h 38m 19s
Total deaths: 0 [0 per hour]
Total games (approx): 41 [64,2 per hour]
Total XP gained: 90070,04 million [141036,55 million per hour]
Total Gold gained: 264,24 Thousand [413,76 Thousand per hour]
===== Item DROP Statistics =====
Items:
Total items dropped: 144 [225,48 per hour]
Items dropped by ilvl:
Items dropped by quality:
- White: 1 [1,57 per hour] {0,69 %}
- Magic: 72 [112,74 per hour] {50 %}
- Rare: 66 [103,35 per hour] {45,83 %}
- Legendary: 5 [7,83 per hour] {3,47 %}
Last moments of Manglemaw.