10. It is forbidden to use the "Astral Gate" spell to jump from any zone to the opponent's starting zone if the connecting portal/garrison has not been breached. It is also forbidden to use the "Astral Gate" spell to jump into the opponent's adjacent zone and then, in the same turn, run into the opponent's starting zone.

The only possible interpretation of the first sentence of rule 10: if the portal/passage to the opponent's starting zone is not breached, then using the "Astral Gate" spell to jump into the opponent's starting zone is forbidden. Consequently, if the portal/passage to the opponent's starting zone is breached, then using the "Astral Gate" spell to jump into the opponent's starting zone is allowed.
If the opponent breaches a passage into your starting zone, be prepared for their jump. There are no theoretical passages.

It is also forbidden to use the "Astral Gate" spell to jump into the opponent's adjacent zone and then, in the same turn, run into the opponent's starting zone.

What's so terrible about that?
It is forbidden to run into the starting zone, which means that at least one turn will be spent deciding how to counter the opponent in the given situation.
And then, there are only a few players who, by the 3rd week, will be able to create such a situation for chudo_ud0...