The 14th-level School of Illusion wizard feature, Illusory Reality, can make an object in an illusion spell real for one minute (PHB, p. 118):
When you cast an illusion spell of 1st level or higher, you can choose one inanimate, nonmagical object that is part of the illusion and make that object real. You can do this on your turn as a bonus action while the spell is ongoing. The object remains real for 1 minute. For example, you can create an illusion of a bridge over a chasm and then make it real long enough for your allies to cross.
The object can’t deal damage or otherwise directly harm anyone.
If the illusion spell ends before that minute is up, either through the spell's duration finishing, the spell being Dispelled, or the caster losing concentration, does the "real" object persist for the full minute?