Perhaps just other usages of "im Urlaub" enhanced, like "im Urlaub erlebten wir das und das", "im Urlaub hatten wir schönes Wetter" and so forth. "In Urlaub" as in presently becoming there, appears to be absolutely Mistaken in Higher-Austrian, but I do not find out about the Germans. I have https://bihlmayermedia-bilder.com/urlaub/wir-sind-im-urlaub/