Coming around with a bug report for Shred and Mangle effects. As you all well know, Shred damage gets buffed by bleeds and bleed increasing effects. That list includes Mangle, Trauma, Hemo, Tendon Rip(Hyena), and Stampede(Rhino). Shred damage is working as intended for Mangle and Trauma only. For Hemo, TR and Stampede(assuming) we are not receiving that buff to our damage.
Any feral that has been relying on Sub Rogue or Hunter pet to keep up their bleed debuff has been unintentionally tanking their damage.
There is a Bug Report on the official (US) forums here:
Shred not getting the mangle buff - Forums - World of Warcraft
And as for proof, here's a quick snippet of logs:
[12:35:00.336] Reesi casts Shred on Raider's Training Dummy
[12:35:00.336] Reesi Shred Raider's Training Dummy 14410
[12:35:02.177] Reesi Rip Raider's Training Dummy *13045*
[12:35:02.800] Reesi casts Rip on Raider's Training Dummy
[12:35:02.820] Raider's Training Dummy's Rip is refreshed by Reesi
[12:35:03.989] Reesi Rip Raider's Training Dummy 6333
[12:35:05.298] Vexate casts Hemorrhage on Raider's Training Dummy
[12:35:05.298] Vexate Hemorrhage Raider's Training Dummy 4127
[12:35:05.298] Reesi's Mangle fades from Raider's Training Dummy
[12:35:05.298] Raider's Training Dummy afflicted by Hemorrhage from Vexate
[12:35:06.082] Reesi Rip Raider's Training Dummy 6333
[12:35:06.788] Reesi casts Shred on Raider's Training Dummy
[12:35:07.028] Reesi Shred Raider's Training Dummy 11127
World of Logs - Real Time Raid Analysis
Presumably the Rhino pet debuff is also not working. I only tested with a Hyena and assumed Rhino would be the same. Additionally... Who raids as BM, much less with a Rhino? I also believe the same bug is happening with Glyphed Maul on secondary targets, but I haven't had the chance to test that out yet.
Gotta wonder how long it's been that way?