What happens if you have three passwall effects and dismiss the outer two passwalls while someone(s) is(are) inside. They'd be ejected after the spell ran out because its obviously not meant to be a murder-spell but you could leave them there for at least ten hours.
This has all sorts of applications like hiding refugees or forbidden items.
Just throw out ideas here, get them out of your head, of interesting ways to use spells or items.
Things like: what happens when you cast shrink item on a bag of holding , use the option to change its composition and then put it into another bag of holding. You changed what it is so I don't think it still counts as extra dimensional space until the spell wears off. Hell, even if you can't put it into another BOH you can stick the whole thing in your pocket and still don't have to lug around a 2 foot by 5 foot bag. Then permanency the f#&*er.
Yeah yeah, that first one, pretty sure whoever was in there would die. When it ends it ejects people from the exit, the problem being, the way you described it, it won't have an exit.