I think this is not intended behavior. I have reported this. Thanks for your report.
Meanwhile, you can change conditional formatting rule with JSL.
Preferences(
Conditional Formatting Rules(
RuleSet(
RuleName( "Capability Index" ),
LessThan(
Value( 1 ),
Inclusive( 0 ),
Format( Back Color( "Red" ), TextAlpha( 1 ) )
),
Range(
MinValue( 1 ),
MaxValue( 1.33 ),
InclusiveStart( 1 ),
InclusiveEnd( 1 ),
EndBackColor( "Yellow" ),
Format( Back Color( "Yellow" ) )
),
GreaterThan(
Value( 1.33 ),
Inclusive( 0 ),
Format( Back Color( "Green" ), TextAlpha( 1 ) )
)
)
)
);