erroneous "Mismatch between member and argument types." Related to parametric signedness?

[dank-openai]

Describe the bug

pub struct foo<IS_SIGNED: bool , NUM_BITS: u32> {
    data: xN[IS_SIGNED][NUM_BITS], 
}

#[test]
fn test_instantiate_foo() {
    let _ = foo<false, u32:1> { data: xN[false][1]:0};
}

fails with

0012:     let _ = foo<false, u32:1> { data: xN[false][1]:0};
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^------------^ XlsTypeError: Mismatch between member and argument types.
Type mismatch:
   xN[is_signed=0][1]
vs xN[is_signed=0][1]

Maybe this is related to parametric signedness?

To Reproduce

Compile the above.

Expected behavior
That it works without error.