WoWInterface - help with ContinueOnSpellLoad

spell_desc = {
                type = 'description',
                fontSize = 'medium',
                order = 3.3,
                name = function(info)
                        return GetSpellDescription(spellID)
                end,
            },

spell_desc = {
                type = 'description',
                fontSize = 'medium',
                order = 3.3,
                name = function(info)
                    local spell = Spell:CreateFromSpellID(spellID);
                    spell:ContinueOnSpellLoad(function()
                    return GetSpellDescription(spell:GetSpellID())
                    end);
                end,
            },

This is what I ended up doing for my Mage Portal addon. It might not work for your use but thought I would put it out there to see if it works for you. I recall trying the one you did and it seemed to be intermittent in its use so tried this route and so far it hasn't failed me once I cached the results.

OnEvent Script function contents

Lua Code:

if event == "PLAYER_ENTERING_WORLD" then
        for i,v in pairs(addonData.Spells) do
            C_Spell.RequestLoadSpellData(i)
        end        
    elseif event == "SPELL_DATA_LOAD_RESULT" then
        local spellID,success = ...
        if success and addonData.Spells[spellID] then
            CacheSpellData(spellID)
        end
    end

In my case I have a preset list of spellID's I am interested in so I grab and store when the addon first loads but you can call that RequestLoadSpellData(spellID) function at any point and then watch for it and act according with the other event.

CacheSpellData is a function that stores the data i need to keep for the duration of the addon as for some reason it seems to disappear after a while. I guess the if you snooze you lose scenario.

Lua Code:

local function CacheSpellData(spellID)
    addonData.SpellCache = {}
    addonData.SpellCache[spellID] = {}
    
    local id,fileID = GetSpellTexture(spellID)
    local name = GetSpellInfo(spellID)
    local isKnown = IsSpellKnown(spellID)
    
    addonData.SpellCache[spellID].TextureID = fileID    
    addonData.SpellCache[spellID].Name = name
    addonData.SpellCache[spellID].isKnown = isKnown
    
end

set = function(info, value)
                    selectedDungeon = value;
                    local mapID = selectedDungeon and match(selectedDungeon, "(%d+)")
                    if mapID then mapID = tonumber(mapID) end
                    for i,v in pairs(L.MythicSpellData[mapID]) do
                        GetSpellDescription(i)
                    end   
                    L.UpdateSpellDatabase()
                end,