Seems that Mud Assist didn't work, so I switched to built in Combat Assist and it's getting held up with the bite rotations. I also had to seem to engage the target first for it to start working. In the second clean test, it uses Mage's Ballad and then immediately Paeon.
[02:27:20.863 N] Clearing all hooks.
[02:27:20.863 D] Inserted new hook [TreeStart @0] 2f2bbeb1-d792-49a8-a25c-b4c462a59fd5
[02:27:20.863 D] Replaced hook [PreCombatBuff] 20325a52-8c75-4d80-8efb-1c213e6ccd74
[02:27:20.863 D] Replaced hook [Heal] 8e7d1e93-229f-4836-bd0f-dd7c4bb98fca
[02:27:20.863 D] Replaced hook [Pull] 00582e3f-1a93-4f30-98cd-8cafd93b6f64
[02:27:20.863 D] Replaced hook [CombatBuff] 8d32fdac-94a2-47f5-836f-a6e41c4d9c1f
[02:27:20.863 D] Replaced hook [Combat] 3223592e-03bb-4471-942d-754f9f16d66d
[02:27:20.863 D] Replaced hook [Rest] 7fca8099-f8a4-4631-9bc3-ef4f59665ca4
[02:27:20.863 N] [Kupo] Hooks cleared, re-creating behaviors
[02:27:20.863 D] Replaced hook [Kupo.Combat] e6b23f27-36c3-428d-af81-5d1ade7b37fc
[02:27:20.864 D] Replaced hook [Kupo.Pull] b79cbe7d-49f1-493b-b1c6-bd43ac11ae5d
[02:27:20.864 D] Replaced hook [Kupo.Rest] 887e0bb0-3b43-440d-86ad-44c8ffdf44ba
[02:27:20.864 D] Replaced hook [Kupo.CombatBuffs] e9d8df8a-a4e0-4c26-aeca-37f18086394c
[02:27:20.864 D] Replaced hook [Kupo.Heal] 1a45a12f-2782-477f-8579-3ba5b90b34b4
[02:27:20.864 D] Replaced hook [Kupo.PreCombatBuffs] 10dda9ee-a0fb-4bb0-9a3c-bb203ea5bedc
[02:27:20.864 D] Navigator.Clear()
[02:27:20.864 D] OnStop event
[02:27:20.864 D] OnStop Event Invoking
[02:27:20.864 N] Bot Thread Ended.
[02:29:08.904 N] Bot Thread Started.
[02:29:08.905 N] Starting Combat Assist
[02:29:14.873 N] [Kupo] Applying Barrage
[02:29:14.873 D] DoAction Spell 107 0x106DCDDB
[02:29:14.905 N] [Kupo] Applying Raging Strikes
[02:29:14.905 D] DoAction Spell 101 0x106DCDDB
[02:29:15.705 N] [Kupo] Casting Empyreal Arrow
[02:29:15.705 D] DoAction Spell 3558 0x4000107F
[02:29:16.506 N] [Kupo] Casting Straight Shot
[02:29:16.506 D] DoAction Spell 98 0x4000107F
[02:29:17.339 N] [Kupo] Casting Bloodletter
[02:29:17.339 D] DoAction Spell 110 0x4000107F
[02:29:18.139 N] [Kupo] Casting Mage's Ballad
[02:29:18.139 D] DoAction Spell 114 0x4000107F
[02:29:18.938 N] [Kupo] Casting Army's Paeon
[02:29:18.938 D] DoAction Spell 116 0x4000107F
[02:29:19.873 N] [Kupo] Applying Windbite
[02:29:19.873 D] DoAction Spell 113 0x4000107F
[02:29:23.238 N] [Kupo] Applying Windbite
[02:29:23.238 D] DoAction Spell 113 0x4000107F
[02:29:25.738 N] [Kupo] Casting Straight Shot
[02:29:25.738 D] DoAction Spell 98 0x4000107F
[02:29:28.139 N] [Kupo] Applying Windbite
[02:29:28.139 D] DoAction Spell 113 0x4000107F
[02:29:30.445 N] [Kupo] Applying Venomous Bite
[02:29:30.445 D] DoAction Spell 100 0x4000107F
[02:29:30.738 N] [Kupo] Casting Battle Voice
[02:29:30.738 D] DoAction Spell 118 0x106DCDDB
[02:29:32.739 N] [Kupo] Casting Straight Shot
[02:29:32.739 D] DoAction Spell 98 0x4000107F
[02:29:33.139 N] [Kupo] Casting Bloodletter
[02:29:33.139 D] DoAction Spell 110 0x4000107F
[02:29:35.038 N] [Kupo] Applying Windbite
[02:29:35.038 D] DoAction Spell 113 0x4000107F
[02:29:36.176 N] Stopping the bot. Reasonushed the stop button.
[02:29:36.206 D] CurrentBot.Stop()
[02:29:36.206 D] TreeHooks.Instance.ClearAll()
[02:29:36.206 N] Clearing all hooks.
[02:29:36.206 D] Inserted new hook [TreeStart @0] 9c3c762d-0e34-4ad3-934a-d2b19fce8a30
[02:29:36.206 D] Replaced hook [PreCombatBuff] 20325a52-8c75-4d80-8efb-1c213e6ccd74
[02:29:36.206 D] Replaced hook [Heal] 8e7d1e93-229f-4836-bd0f-dd7c4bb98fca
[02:29:36.206 D] Replaced hook [Pull] 00582e3f-1a93-4f30-98cd-8cafd93b6f64
[02:29:36.206 D] Replaced hook [CombatBuff] 8d32fdac-94a2-47f5-836f-a6e41c4d9c1f
[02:29:36.206 D] Replaced hook [Combat] 3223592e-03bb-4471-942d-754f9f16d66d
[02:29:36.206 D] Replaced hook [Rest] 7fca8099-f8a4-4631-9bc3-ef4f59665ca4
[02:29:36.206 N] [Kupo] Hooks cleared, re-creating behaviors
[02:29:36.207 D] Replaced hook [Kupo.Combat] 13c3b413-472d-4c46-942f-511db79a1564
[02:29:36.207 D] Replaced hook [Kupo.Pull] ab5707b1-b1fd-4150-aacd-223163cf9079
[02:29:36.207 D] Replaced hook [Kupo.Rest] 02fcae27-b4af-4a48-81e4-53852a5960b8
[02:29:36.207 D] Replaced hook [Kupo.CombatBuffs] 6265c3e2-c235-438d-974e-e089e1363f22
[02:29:36.207 D] Replaced hook [Kupo.Heal] 610a0869-e8a5-4afe-a123-6f7d021fc190
[02:29:36.207 D] Replaced hook [Kupo.PreCombatBuffs] 0e548518-72b2-4757-9b85-716395191caf
[02:29:36.207 D] Navigator.Clear()
[02:29:36.207 D] OnStop event
[02:29:36.207 D] OnStop Event Invoking
[02:29:36.207 N] Bot Thread Ended.
I have the same problem