Is ghusl obligatory if traces of a wet dream are found without wetness, knowing that performing ghusl might lead to missing congregational prayer?

If traces of semen are found dry on clothing or the body, ghusl is obligatory, and the presence of wetness is not a condition. Ghusl becomes obligatory in this case, even if one misses congregational prayer or the prayer time expires, according to the majority of scholars. However, if what is meant is merely an erection upon waking, or seeing intercourse, or a wet dream without the presence of semen, then ghusl is not required.