Running Software (issues missing this information will be deleted):

• Addon version:
• Server patch: [e.g. Build 8.0.1.27178]

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Message: [ADDON_ACTION_BLOCKED] AddOn 'Bartender4' tried to call the protected function 'UNKNOWN()'.
Time: Sat Jul 29 13:25:46 2023
Count: 1
Stack: [ADDON_ACTION_BLOCKED] AddOn 'Bartender4' tried to call the protected function 'UNKNOWN()'.
[string "@Interface/AddOns/Bartender4/Bar.lua"]:313: in function LoadPosition' [string "@Interface/AddOns/Bartender4/Bar.lua"]:238: in function ApplyConfig'
[string "@Interface/AddOns/Bartender4/BlizzardArt.lua"]:156: in function ApplyConfig' [string "@Interface/AddOns/Bartender4/BlizzardArt.lua"]:129: in function <Interface/AddOns/Bartender4/BlizzardArt.lua:128> [string "=(tail call)"]: ? [string "=[C]"]: in function MainMenuBar_UpdateKeyRing'
[string "@Interface/FrameXML/MainMenuBar.lua"]:101: in function <Interface/FrameXML/MainMenuBar.lua:82>

Locals: self = BT4BarBlizzardArt {
overlay = BT4BarBlizzardArtOverlay {
}
barTex2 = BlizzardArtTex2 {
}
Execute = defined @Interface/FrameXML/SecureHandlers.lua:777
hidedriver =

{
}
UnwrapScript = defined @Interface/FrameXML/SecureHandlers.lua:788
leftCap = BlizzardArtLeftCap {
}
SetFrameRef = defined @Interface/FrameXML/SecureHandlers.lua:793
barTex3b = BlizzardArtTex3b {
}
WrapScript = defined @Interface/FrameXML/SecureHandlers.lua:782
highLevel = Frame {
}
barTex1b = BlizzardArtTex1b {
}
id = "BlizzardArt"
barTex3 = BlizzardArtTex3 {
}
config = {
}
name = "Blizzard Art"
0 =
barTex1 = BlizzardArtTex1 {
}
barTex0 = BlizzardArtTex0 {
}
rightCap = BlizzardArtRightCap {
}
elapsed = 0
}
LibWin = {
RegisterConfig = defined @Interface/AddOns/Bartender4/libs/LibWindow-1.1/LibWindow-1.1.lua:89
SetScale = defined @Interface/AddOns/Bartender4/libs/LibWindow-1.1/LibWindow-1.1.lua:207
MakeDraggable = defined @Interface/AddOns/Bartender4/libs/LibWindow-1.1/LibWindow-1.1.lua:239
RestorePosition = defined @Interface/AddOns/Bartender4/libs/LibWindow-1.1/LibWindow-1.1.lua:171
OnDragStop = defined @Interface/AddOns/Bartender4/libs/LibWindow-1.1/LibWindow-1.1.lua:226
delayedSavePosition = {
}
SavePosition = defined @Interface/AddOns/Bartender4/libs/LibWindow-1.1/LibWindow-1.1.lua:124
Embed = defined @Interface/AddOns/Bartender4/libs/LibWindow-1.1/LibWindow-1.1.lua:304
EnableMouseOnAlt = defined @Interface/AddOns/Bartender4/libs/LibWindow-1.1/LibWindow-1.1.lua:287
embeds = {
}
OnMouseWheel = defined @Interface/AddOns/Bartender4/libs/LibWindow-1.1/LibWindow-1.1.lua:252
OnDragStart = defined @Interface/AddOns/Bartender4/libs/LibWindow-1.1/LibWindow-1.1.lua:220
windowData = {
}
EnableMouseWheelScaling = defined @Interface/AddOns/Bartender4/libs/LibWindow-1.1/LibWindow-1.1.lua:265
utilFrame = Frame {
}
}

https://wowpedia.fandom.com/wiki/API_UseContainerItem

How to reproduce:

Enter Combat -> open bags -> click any item -> error

It can be avoided if bags are opened once before combat -> enter combat -> open bags -> click any item -> no error