ninja mug not giving additional items

[Hellstorm]

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Date & Time: 1:35pm est 1/2/22
Frequency: all the time
World name: ultros
Character name: silvermist hellstorm
Retainer name: n/a
NPC name: n/a
Monster name:any
Class/Level: ninja
Party or solo: solo
In-game time: 6:28
Area and coordinates:
Housing:
Steps:
1. attempted mug in multiple zones in EW Elpis, Mare Lamentourum, Garlemald received 0 procs of additional items
2. then went to East Thanalan to see if this just EW problem or a game wide bug tested 1 shot mug on 10 Myotragus Nanny got 0 procs of additional items
3. in short mug additional effect not working

[DrWho2010]

it is only a "chance" of getting additional items. RNGesus gonna RNGesus.

[Rongway]

If the probability is not 0% or 100% there are no guarantees. You can go 100 rounds without seeing a 90% drop item and the system would still be working properly.