Just as suspicions about the world being flat could also be wrong

Correct, which is why suspicion, aka belief, must always be identified and excised if you wish to be even remotely capable of objective study (of anything).

as well as our current understanding of weight only acting downward.

That is more or less demonstrable - aka, a law. However weight doesn't act in any direction necessarily - it is just an intrinsic property of matter. Wether that weight is directed down, up, or neither is defined by its relationship to the media it displaces.

Precisely!

And that is precisely the reason we don't research the "cube earth". Looks like you have, and now understand, your answer.

Just as suspicions about the world being flat could also be wrong

Correct, which is why suspicion, aka belief, is to be identified and excised if you wish to be even remotely capable of objective study (of anything).

as well as our current understanding of weight only acting downward.

That is more or less demonstrable - aka, a law. However weight doesn't act in any direction necessarily - it is just an intrinsic property of matter. Wether that weight is directed down, up, or neither is defined by its relationship to the media it displaces.

Precisely!

And that is precisely the reason we don't research the "cube earth". Looks like you have, and now understand, your answer.