Previously, Switch node were using the fallback behavior when they were muted. That implied that the generated internal link was generally not very useful. This patch makes the behavior of muted switch nodes explicit. Now the internal link will always point to the first value input and never to the condition input. Note, for the Menu Switch node this does not make a difference yet, because menu sockets are not supported there yet (#138704). Pull Request: https://projects.blender.org/blender/blender/pulls/138724