SA1008 for is expressions with parens in c#9

[webczat]

I am using the stylecop analyzers 1.1.18, also tried with newest 1.2.0 betas...
I get SA1008 triggered unnecessarily for this:

return b is (>= 0 and <= 31) or 127;

The problem is between the is and left paren of course, it requests me to remove a space that the vs formatter adds. Also I guess space actually should be there.