Multiple image upload using imageUploader UiComponent not working

I am trying to create a multi-image upload field in customer_form.
Referring the official docs, I used ImageUploader Uicomponent. Since, it extends FileUploader UiComponent I have added isMultipleFiles configuration to true.

But I am not able to select multiple files. I tried this in a fresh Magento 2.4.3 install, still no success.

Here is my code:

<field name="seller_banners" formElement="imageUploader">
    <settings>
        <notice translate="true">Upload multiple seller banners.</notice>
        <label translate="true">Seller Banners</label>
        <componentType>imageUploader</componentType>
    </settings>
    <formElements>
        <imageUploader>
            <settings>
                <allowedExtensions>jpg jpeg png</allowedExtensions>
                <maxFileSize>2097152</maxFileSize>
                <isMultipleFiles>true</isMultipleFiles>
                <uploaderConfig>
                    <param xsi:type="url" name="url" path="catalog/category_image/upload"/>
                </uploaderConfig>
                <previewTmpl>Magento_Catalog/image-preview</previewTmpl>
                <openDialogTitle>Media Gallery</openDialogTitle>
                <initialMediaGalleryOpenSubpath>catalog/category</initialMediaGalleryOpenSubpath>
            </settings>
        </imageUploader>
    </formElements>
</field>

Official Docs:

Screenshots:

It seems the isMultipleFiles value is not changed/reflected in the DOM. It is still false when I checked using KnockoutJS debugger. At the sametime, maxFileSize and allowedExtensions works fine. Editing file-uploader.js and changing the default value of isMultipleFiles to true works.