What kind of toilet is it? https://wiki.openstreetmap.org/wiki/Tag:amenity%3Dtoilets
If it is mobile like those https://upload.wikimedia.org/wikipedia/commons/e/ea/ECO_Toilets_at_the_Station_Groningen%2C_Groningen_%282019%29_02.jpg then it might be temporary (we don't map such features)