Seems like the addon breaks when using it on the beta. It seems to work on live for some reason.
I tested if it was because it was on an Evoker too, but it wasn't the reason.
Using similar addons on both beta and live.

Page 1:
Message: .../LibAppropriateItems-1.0/LibAppropriateItems-1.0.lua:41: table index is nil
Time: Wed Nov 9 21:43:39 2022
Count: 1
Stack: .../LibAppropriateItems-1.0/LibAppropriateItems-1.0.lua:41: table index is nil
[string "@Interface/AddOns/SimpleItemLevel/lib/LibAppropriateItems-1.0/LibAppropriateItems-1.0.lua"]:41: in main chunk

Locals: lib =

{
CanEquip = defined @Interface/AddOns/SimpleItemLevel/lib/LibAppropriateItems-1.0/LibAppropriateItems-1.0.lua:8
IsAppropriate = defined @Interface/AddOns/SimpleItemLevel/lib/LibAppropriateItems-1.0/LibAppropriateItems-1.0.lua:14
}
oldMinor = nil
_ = "Evoker"
playerclass = "EVOKER"
valid_classes = nil
(*temporary) = {
}
(*temporary) = {
}
(*temporary) = nil
(*temporary) = {
}
(*temporary) = nil
(*temporary) = "table index is nil"

---

Page 2:
Message: Interface/AddOns/SimpleItemLevel/addon.lua:225: GameTooltip doesn't have a "OnTooltipSetItem" script
Time: Wed Nov 9 21:43:39 2022
Count: 1
Stack: Interface/AddOns/SimpleItemLevel/addon.lua:225: GameTooltip doesn't have a "OnTooltipSetItem" script
[string "=[C]"]: in function `HookScript'
[string "@Interface/AddOns/SimpleItemLevel/addon.lua"]:225: in main chunk

Locals: (*temporary) = GameTooltip {
0 =
SetQuestLogRewardSpell = defined @Interface/SharedXML/Tooltip/TooltipDataHandler.lua:444
SetQuestPartyProgress = defined @Interface/SharedXML/Tooltip/TooltipDataHandler.lua:444
ProcessLineData = defined @Interface/SharedXML/Tooltip/TooltipDataHandler.lua:303
SetPvpTalent = defined @Interface/SharedXML/Tooltip/TooltipDataHandler.lua:444
SetRuneforgeResultItem = defined @Interface/SharedXML/Tooltip/TooltipDataHandler.lua:444
SetHyperlink = defined @Interface/SharedXML/Tooltip/TooltipDataHandler.lua:444
SetUnit = defined @Interface/SharedXML/Tooltip/TooltipDataHandler.lua:444
SetAzeriteEssence = defined @Interface/SharedXML/Tooltip/TooltipDataHandler.lua:444
SetVoidDepositItem = defined @Interface/SharedXML/Tooltip/TooltipDataHandler.lua:444
SetVoidWithdrawalItem = defined @Interface/SharedXML/Tooltip/TooltipDataHandler.lua:444
SetInfoBackdropStyle = defined @Interface/SharedXML/Tooltip/TooltipDataHandler.lua:338
shoppingTooltips =

{
}
SetSocketGem = defined @Interface/SharedXML/Tooltip/TooltipDataHandler.lua:444
updateTooltipTimer = 0.200000
ItemTooltip = Frame {
}
StatusBar = GameTooltipStatusBar {
}
SetLootCurrency = defined @Interface/SharedXML/Tooltip/TooltipDataHandler.lua:444
SetSlottedKeystone = defined @Interface/SharedXML/Tooltip/TooltipDataHandler.lua:444
SetWorldCursor = defined @Interface/FrameXML/GameTooltip.lua:943
SetLootItem = defined @Interface/SharedXML/Tooltip/TooltipDataHandler.lua:444
SetMerchantCostItem = defined @Interface/SharedXML/Tooltip/TooltipDataHandler.lua:444
GetUnit = defined @Interface/FrameXML/GameTooltip.lua:985
SetOwnedItemByID = defined @Interface/SharedXML/Tooltip/TooltipDataHandler.lua:444
SetItemInteractionItem = defined @Interface/SharedXML/Tooltip/TooltipDataHandler.lua:444
SetQuestLogSpecialItem = defined @Interface/SharedXML/Tooltip/TooltipDataHandler.lua:444
TextRight1 = GameTooltipTextRight1 {
}
SetEnhancedConduit = defined @Interface/SharedXML/Tooltip/TooltipDataHandler.lua:444
SetRecipeReagentItem = defined @Interface/SharedXML/Tooltip/TooltipDataHandler.lua:444
SetQuestCurrency = defined @Interface/SharedXML/Tooltip/TooltipDataHandler.lua:444
supportsDataRefresh = true
SetWeeklyReward = defined @Interface/SharedXML/Tooltip/TooltipDataHandler.lua:444
SetMerchantItem = defined @Interface/SharedXML/Tooltip/TooltipDataHandler.lua:444
SetPvpBrawl = defined @Interface/SharedXML/Tooltip/TooltipDataHandler.lua:444
SetAchievementByID = defined @Interface/SharedXML/Tooltip/TooltipDataHandler.lua:444
BottomOverlay = Texture {
}
SetSpellByID = defined @Interface/SharedXML/Tooltip/TooltipDataHandler.lua:444
supportsItemComparison = true
SetSocketedRelic = defined @Interface/SharedXML/Tooltip/TooltipDataHandler.lua:444
ProcessInfo = defined @Interface/SharedXML/Tooltip/TooltipDataHandler.lua:236
ProcessLines = defined @Interface/SharedXML/Tooltip/TooltipDataHandler.lua:293
NineSlice = Frame {
}
SetInventoryItem = defined @Interface/SharedXML/Tooltip/TooltipDataHandler.lua:444
RefreshData = defined @Interface/FrameXML/GameTooltip.lua:924
SetTransmogrifyItem = defined @Interface/SharedXML/Tooltip/TooltipDataHandler.lua:444
SetLootRollItem =

---

Page 3:
Message: Interface/AddOns/SimpleItemLevel/lib/LibAppropriateItems-1.0/LibAppropriateItems-1.0.lua:1 (null)
Time: Wed Nov 9 21:43:47 2022
Count: 1

---

Page 4:
Message: Interface/AddOns/SimpleItemLevel/addon.lua:1 (null)
Time: Wed Nov 9 21:43:47 2022
Count: 1

---

Page 5:
Message: Interface\FrameXML\Bindings.xml:1 Interface/AddOns/SimpleItemLevel/lib/LibAppropriateItems-1.0/LibAppropriateItems-1.0.lua:1 (null)
Time: Wed Nov 9 21:43:47 2022
Count: 1

---

Page 6:
Message: Interface\FrameXML\Bindings.xml:1 Interface/AddOns/SimpleItemLevel/addon.lua:1 (null)
Time: Wed Nov 9 21:43:47 2022
Count: 1