[eMTe]

Weird question, but is it possible to find oneself in an unwinnable situation? Or is it a bug?

I am playing Doom (and Doom2) from beginning to end, on various difficulties, and already encountered dead ends on two occasions, one in D1, one in D2. Speaking of D1, cant name the level now, because Im writing from smartphone, but I rentered one of small rooms, accessible only via some switch combination, the door closed behind me and now I am trapped. Theres a switch inside (which is used for door or not, cant say now), but it is lit green, so it is not pressable anymore
Door doesnt react to opening tries. So its either bug or dead end, but Ive never heard of the latter in Doom, except natural combat situations where you are stuck without ammo, but its different story.