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Box moves 1 inch and the portal poofs due to an unstable surface.
This always bothers me when people argue what would happen if you pushed Portal portals into each other. You can't. The moment the surface moves, it's unstable and the portal pops. They're quite specific about this in the games.
They have a flag to disable that specific behaviour for that specific scene IIRC.
It’s still canon, no?
In this case, the portals are only moving in planes parallel to each other, so there is no stability introduced.
Portal surfaces can move. By nature everything is moving, we just happen to be in the same frame of reference.
Regardless, here is a video of a portal on a moving surface from portal 2. https://youtu.be/OrAHvenjZpA?si=VY5dRvUP8_LPgOPO (around the 1 minute mark)
Additionally shooting a portal on the moon also demonstrates that movement is allowed (since the moon is in a non synchronous orbit)