This issue was originally started by email.
The state of legend buttons seem to give the opposite feedback than what is expected.
The legend buttons used to control visibility of a series on a chart are announced as “Show [range] toggle button [pressed/not pressed]”. When the series is hidden, the button state is announced as “not pressed” and when the series is not hidden it is announced as “pressed”.
It would seem like it’s using the hover states as the “pressed state”. When you tab to the legend category, it says “pressed” but when you hit “enter” it says “not pressed”, when it actually is.
“Pressed” (series is still visible)
“Not pressed” (series is no longer visible)