Checkbox toggle not matching input

Question

Is it no longer possible to toggle a "checkmark" input box to match a coded switch? I believe we used to be able to do this and have the checkmark box toggle on/off accordingly.

For example:

var A = input(true,title="A")
var B = input(false,title="B")

if B == true
    A := false
else
    if A == true
        B := false
    
inputColor = if A == true
    color.white    
else if B == true
    color.red    
else
    na
    
plot(sma(close,21),title="21 sma",color=inputColor)
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In this example the switch is functional in changing the plot color parameter but the checkbox doesn't toggle on and off accordingly.