Simple truth of the Portal Problem

Recently saw Destiny argue the "portal problem" which asks:

When one side of a portal passes over a stationary object as speed X, with the exit portal also being stationary, does the object:

A) "plop" down upon exiting since it was originally stationary or

B) exit with roughly X speed because the portal passed through it that fast

Neither are plausible given our current understanding of physics. Destiny holds firm B is the only possible solution, ignoring the Conservation of Momentum in half of his argument.

He argues that since the exit portal isn't moving that the object exits at the same speed of the entry portal, giving the object momentum and causing it to launch out with initial velocity X.

Ignoring the creation of infinite energy required to give a stationary object momentum with no force applied in the first place, at every instant upon the object beginning to pass through, it already has gained some momentum. This means as the object continues to pass through, more and more mass begins to exert real force on the portion of the object that was originally stationary and still on the platform it's on, causing it to accelerate towards the portal.

This causes the object to actually begin passing through faster than the entry portal is moving, and continues to loop at every instant in time as more mass gains momentum from nowhere and pulls on the rest of the object.

Since we don't have anything even resembling a model for the mechanics of a portal in physics, this acceleration could be anywhere from a couple times the original speed squared up to a speed at which the object rips apart due to the force of it on itself. And how would that look on the molecular level? Atoms would function the same way, pulling on themselves as they pass through until they split and suddenly any matter passing through a portal becomes a catastrophic nuclear explosion.

All in all, the problem is currently unsolvable as you can't just logically rationalize your way through a problem that conflicts with the laws of physics in a way we can't explain. You'd have to properly define how the portal functions before you pose the problem at all.

The only solution that would fit our understanding of physics would be to stipulate that when one portal is moving and has an object pass through it, the exit portal must move in the opposite direction at equal speed, leading to the object phasing through and not creating or destroying any energy; meaning a "plop" and the exit portal being moved the distance of the object away backwards.