I know I have reported this before, but it is still happening in 2.3 and it is VERY annoying so I am reporting it again.

The logic for who can occupy a subspace gate is, in my opinion, very flawed for the following reasons:

1. Ships from more than one civ can occupy a subspace gate, even if they are at war with each other.
   1. this is the only place in the game where this can occur and, in my opinion, it should not
2. If I am at war with one of the civs whose ships are on a subspace gate, but not with another civ that has ships on the same subspace gate, I cannot attack the ships with which I am at war without declaring war on all of the civs that have ships on that subspace gate.

I have uploaded a save file that demonstrates these issues:

https://www.dropbox.com/scl/fi/xq38b5vlztrv5yhfdc66g/Subspace-Gate-Issue-Under-2.3.504017.GC4Sav?rlkey=r1ly43j1qxge553dzyuj2ivdq&dl=0

Here are my suggestions for how to fix this:

1. Treat subspace gates like any other cell:
   1. you may only move to that subspace gate if it is empty or if you have ships on that subspace gate
   2. If a civ with which you are at war has ships on that subspace gate you may attack them
   3. If a civ with which you are not at war has ships on that subspace gate you may choose to go to war with them and attack
   4. otherwise, you may not move to that subspace gate
2. If, for some reason, you cannot implement option 1 above, then modify the attack logic to recognize which ships and fleets on the target subspace gate belong to a civ with which you are at war and execute the attack logic against them.