register() isn't saving Birthdate

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Hi all, I’m using register from wix-members-backend to handle a custom registration flow. Registration works fine except the birthdate isn’t saved. I’ve worked around this by sending the birthdate to the confirmation url query params, but surely there’s a way of saving birthdates without doing that.

What am I missing here? My code is as follows:
registration.jsw

export async function doRegistration(email, pw, payload) {
    //b is the user's obscured birthdate
    const { contactInfo, page, b } = payload
    const options = {
        contactInfo
    }
    //create label array
    const labelKeys = ["Member label"]

    //add labels based on registration answers
    if(contactInfo["Custom field 1"] == "yes") {
        labelKeys.push("Label 1")
    } else {
        labelKeys.push("Label 2")
    }

    if(contactInfo["Custom field 2"] == "yes") {
        labelKeys.push("Label 3")
    }
    options.contactInfo["labels"] = labelKeys

    try {
        const res = await authentication.register(email, pw, options)
        await triggeredEmails.emailMember('confirmationEmail', res.member._id, {
            variables: {
            //sends a link with the page the user registered from and their obscured birthdate
                confirmUrl: `domain/regis-conf?tk=${res.approvalToken}&pg=${page}&b=${b}`
            }
        })
        return res
        
//----- rest of code -----

register() gets this options object

{
    contactInfo: {
        firstName: "name",
        lastName: "name",
        //birthdate IS NOT saved
        birthdate: "2021-11-27", //follows the format requested in updateContact
        "Custom field 1": "some val",
        "Custom field 2": "some val",
        labels: ["Member Label", "Custom label 1", "Custom Label 2"]
    }
}

Everything is being written to user data except birthdate. Is it the wrong key name? Am I passing the wrong format? Is this a bug?