When we try to pass the double value to the TCK component in studio, it will be rounded to 5 decimal places. I.e. when we have a double value 0.123456789 it will be rounded to 0.12346

Looks like the problem happens in the MappingUtils.coerce() method

if (Double.class == expectedType) {
    return new BigDecimal(Double.class.cast(value)).setScale(5, RoundingMode.HALF_UP).doubleValue();
}

We can see that we have rounding to 5 decimal places for any double value.