When allied with a civ that goes to war, the ally will initiate a "Call To War" menu that prompts for a decision to either support your ally or stay neutral.
Expectation: supporting the ally should lead to your civ declaring war on the target.
What happens: clicking support ally actually does the same thing as staying neutral and ends your alliance.
Workaround: You can exit the menu and manually declare war, which bypasses the "Call To War" menu, leading to the expected outcome.
Expectation: supporting the ally should lead to your civ declaring war on the target.
What happens: clicking support ally actually does the same thing as staying neutral and ends your alliance.
Workaround: You can exit the menu and manually declare war, which bypasses the "Call To War" menu, leading to the expected outcome.