Tags won't update timely when some offline

[siweia]

oUF.Tags.Methods["color"] = function(unit)
    local class = select(2, UnitClass(unit))
    local reaction = UnitReaction(unit, "player")
 
    if UnitIsDeadOrGhost(unit) or not UnitIsConnected(unit) then
        return "|cffA0A0A0"
    elseif UnitIsTapDenied(unit) then
        return hexRGB(oUF.colors.tapped)
    elseif UnitIsPlayer(unit) then
        return hexRGB(oUF.colors.class[class])
    elseif reaction then
        return hexRGB(oUF.colors.reaction[reaction])
    else
        return hexRGB(1, 1, 1)
    end
end
oUF.Tags.Events["color"] = "UNIT_HEALTH_FREQUENT UNIT_CONNECTION PLAYER_FLAGS_CHANGED"

The code above is currently used to update name color for RaidFrame in my layout.
It is not update properly when someone goes offline. And the name color stay in class color.
Or someone goes online, and the name stuck in gray.
Am I missing any events?