After he returned to his portal he was unable to retrieve his items, because they seemed to have disappeared. Also it was way less than 5 minutes when he went to get back his items.
Comments 2
The environment field is for your computer environment, such as OS and hardware, not for where in-game the bug happened. You also should be more specific about the issue and try to find the items or check the log and things like that. There is simply not enough information to work with, please be more specific and check to see if it actually is a bug first before reporting it.
Did the items teleport through the portal into the other dimension?