Cannot define blocks with group in existing category, say 'Math', and specify group order?

The groups attribute on an already existing namespace block category does not get applied to the existing category definition.

For example, if a target defines additional blocks in category Math using the usual namespace declaration, the attribute 'groups' does not seem to be applied to the existing category definition.

For example in the marked up declarations below the intent is to have the Vector group be below the built-in blocks that already exist in category Math.

Is there another way to do this?

//% groups='["other", "Vector"]'
declare namespace math {
    /**
     * Create vector.
     * @param x number, eg: 0
     * @param y number, eg: 0
     * @param z number, eg: 0
     */
    //% blockId="vector"
    //% block="X %x|Y %y|Z %z"
    //% group="Vector"
    //% shim=math3d::vector
    function vector(x?: number, y?: number, z?: number): Vector;

    /**
     * Unit vector.
     */
    //% blockId="vector_unit"
    //% block="unit vector"
    //% group="Vector"
    //% shim=math3d::unitVector
    function unitVector(): Vector;

    /**
     * Convert degress to radians.
     * @param degrees number, e.g. 0
     */
    //% blockId=convert_deg_to_rad
    //% block="%degrees degrees in radians"
    //% shim=math::degreesInRadians
    //% advanced=true
    function degreesInRadians(degrees: number): number;

    /**
     * Convert radians to degrees.
     * @param radians number, e.g. 0
     */
    //% blockId=convert_rad_to_deg
    //% block="%radians radians in degrees"
    //% shim=math::radiansInDegrees
    //% advanced=true
    function radiansInDegrees(radians: number): number;
}

Start by tracing how the TypeScript namespace declaration and its groups attribute are processed for an existing category such as Math. Confirm that the Vector group is ordered below the built-in Math blocks, while the other declarations retain their stated grouping.