C_TransmogCollection.GetAppearanceSources does not return all sources

[Partholan]

Hello everyone,
first of all a big thank you to everyone here. I have often found solutions to my problems here.

Unfortunately not today

My goal:
To create a "CSV" list of transmog to filter them in Excel etc.

--example for Legs
local index = 1
local output = {}
output[index]=table.concat({"appearanceCollected","visualId","sourceId","sourceCollected","itemId","sourceType"},";")
 
local sourceNames = {"","Boss Drop","Quest","Vendor","World Drop","Achievement","Profession"}
 
local appearancesList = C_TransmogCollection.GetCategoryAppearances(10) --Legs
for appearanceIndex = 1, #appearancesList do
    local appearancesCollected = appearancesList[appearanceIndex].isCollected
    local appearancesVisualID = appearancesList[appearanceIndex].visualID
 
    local appearanceInfos = {}
    local sourcesList = C_TransmogCollection.GetAppearanceSources(appearancesVisualID)
    for sourceIndex = 1, #sourcesList do
        index = index + 1
        appearanceInfos[1] = tostring(appearancesCollected)
        appearanceInfos[2] = appearancesVisualID
        appearanceInfos[3] = sourcesList[sourceIndex].sourceID
        appearanceInfos[4] = tostring(sourcesList[sourceIndex].isCollected)
        appearanceInfos[5] = sourcesList[sourceIndex].itemID
        appearanceInfos[6] = sourceNames[(sourcesList[sourceIndex].sourceType or 0) + 1]
        output[index] = table.concat(appearanceInfos,";")
    end    
end
 
output = table.concat(output,"\n")
--output is then sent to an editbox

This works syntactically.

My problem:
For example:
C_TransmogCollection.GetAppearanceSources(11296) creates three entries

visualId	sourceId	itemId
11296		21670		45141
11296		21968		45536
11296		22087		45846

However, there should be at least four (maybe more), since the item (itemID=155942) also has the appearance (appearanceID=11296) (see C_TransmogCollection.GetItemInfo(155942)).
I am on the correct character to wear these items (Level 50 Feral Druid).

My question:
Is this a bug in C_TransmogCollection.GetAppearanceSources or am I missing something somewhere?

Greetings
Partholan