The static dungeons were reworked to generate more group content be it PVE/PVP, but currently it is infested with Rats that are just pushing on mobs and becoming invisible and this ends up generating less group content in these dungeons, as they are always frustrating and impossible to make some boss or fight against some group in these places.
My suggestion would be that there are mobs that reveal invisible in these places and when your invisible is revealed you will get a debuff and cannot be invisible again for some time.
My suggestion would be that there are mobs that reveal invisible in these places and when your invisible is revealed you will get a debuff and cannot be invisible again for some time.