Since the SOTO patch, I have noticed that there is an issue with the "Click to leave instance" button in Home Instances. Regardless of the instance owner's race and the racial city location, any other players in party with the instance owner do not have the "Click to leave instance" button if the character in the instance is of the race whose racial city the instance is in. Other races do have access.
For example, on my main account, I can enter the home instance in any city on any race and have the button. However, if I bring my 2 alt accounts in, and alt account 1 is on a Norn toon and alt account 2 is on a Human toon, and we are in DR, the Norn toon will have the button but the Human does not. This means they have to go to character select, run back to the instance entrance and either run out of the door or interact with the green star to get the "Exit to (City name)" prompt, or wait until the instance owner leaves and they are kicked.
I tested this extensively today - it occurs in every city. I have not tested if this would also occur during a story step that happens in a racial city.
They say "Home is where the heart is" but I think this is taking it a bit far, that once you go home, they make it really really hard to leave. 😉