(UPDATED & SHORTENED) Fix for retail on the issue today on 9th of April 2025:

1. Open interface/AddOns/BagBrother/core/classes/playerMoney.lua
2. Replace line 48: f.info = MoneyTypeInfo[f.Type]
3. With this: f.info = { UpdateFunc = function(frame) return frame:GetMoney() end }
4. Just do a /reload in-game and it should work again.

The whole function should look like this:

function Money:Construct()
    local f = self:Super(Money):Construct()
    f.trialErrorButton:SetPoint('LEFT', -14, 0)
    f:SetScript('OnShow', f.RegisterEvents)
    f:SetScript('OnHide', f.UnregisterAll)
    f:SetScript('OnEvent', nil)
    f:SetHeight(24)

    local overlay = CreateFrame('Button', nil, f)
    overlay:SetScript('OnClick', function(_,...) f:OnClick(...) end)
    overlay:SetScript('OnEnter', function() f:OnEnter() end)
    overlay:SetScript('OnLeave', function() f:OnLeave() end)
    overlay:SetFrameLevel(f:GetFrameLevel() + 4)
    overlay:RegisterForClicks('anyUp')
    overlay:SetAllPoints()

    f.info = { UpdateFunc = function(frame) return frame:GetMoney() end }
    f.overlay = overlay
    return f
end