Perhaps just other usages of "im Urlaub" greater, like "im Urlaub erlebten wir das und das", "im Urlaub hatten wir schönes Wetter" and so on. "In Urlaub" as in currently staying there, appears to be absolutely Erroneous in Higher-Austrian, but I do not learn about the Germans. I've also heard https://bihlmayermedia-bilder.com/urlaub/wir-sind-im-urlaub/