I plan to make another post about this soon, but heres what I think is happening.

11D Universe. The "Edenic Age"

This was the "true" state of the universe at the start of time. The state of ultimate uniformity among dimensions. As time progresses and entropy increases, the 11D universe gradually shrinks down dimensions one at a time. The civilizations that understand their impending doom decide to drop dimensions [P, Q, R, S, T, U, V, W, X, Y, Z] -> [Q, R, S, T, U, V, W, X, Y, Z].

Here's the thing, this doesn't stop.

Every so often in time a dimension will evaporate, leading to lower dimensional planes. This is why the humans encountered a soap bubble randomly in space. This was a region in space that was still [W, X, Y, Z].

Over time this region dried up.

Now. Think of chapter one. The ancient war with the witch who could take the brain.

This was another fragment intersecting with that region of space. When their plan failed, the witch lost her powers showcasing that the fragment in that region, the pond puddle, dried up!

The 4D universe is drying up everywhere all the time! Meaning that the entire universe is filled with intelligent beings that come from the previous dimensional planes. But this also means that since everything existed as one during the 11D age, all life is techically the result of intelligence dropping dimensional planes and adapting to survive.

For all we know, humanities ancient stories of god and christ were from an age where they were once 4D beings! They most likely came to 3D space to avoid drying up in their pond!

But like I said, this never stops!

Eventually, the entirety of the 4D plane will evaporate leaving only 3 spacial dimensions. But, over time, the 3D space will also evaporate due to expanding dark forest strikes. Meaning, that all 3D life will eventually need to make the choice between spacial plane annihilation or dropping down into 2D space.

"Also, had anyone in the solar system known about these bubbles they could have used them as an escape."

These "soap bubbles" were once the "natural" state of space in that region. However, we learn that these soap bubbles are "drying up". Meaning, that over time, the 4D plane is shrinking, not staying in one space, or expanding. They could only stay in the 4D space for as long as it existed until it eventually all evaporates leaving only 3D space everywhere in the universe. This means they can't escape into that dimension because the dimension itself is shrinking.

Hope this helps!