Switch Twig condition Case with OR condition (two values in the case)
This currently isn't a supported syntax for the Twig switch statement.

Craft will take that line and compile it down to:

case ("A1" || "A2"):


Which will always evaluate to true, which is why you always get the first result.

In order for it to work, it would need to be either:

case "A1":
case "A2":


To take advantage of PHP's fall-through support or the more ugly:

case ($context["bodyClass"] == "A1" || $context["bodyClass"] == "A2")