Frontend forms - creating taxonomy submits form

Hello, I am trying using frontend forms and it works well. However I have stumbled upon some strange behavior with creating taxonomy + required input combo.

When there is only taxonomy field and I am trying to add new term on frontend everything works fine. When there is another required field, e.g. some input, creating new term sends second request which tries to submit whole form.

https://user-images.githubusercontent.com/2657856/161590958-1df38a11-b21e-46a3-9d98-8d1062eba4a8.mov

Here is the exported fields group:

[
    {
        "key": "group_624b1a511114d",
        "title": "Error test",
        "fields": [
            {
                "key": "field_624b1a70171aa",
                "label": "Input",
                "name": "input",
                "type": "text",
                "instructions": "",
                "required": 1,
                "conditional_logic": 0,
                "wrapper": {
                    "width": "",
                    "class": "",
                    "id": ""
                },
                "default_value": "",
                "placeholder": "",
                "prepend": "",
                "append": "",
                "maxlength": ""
            },
            {
                "key": "field_624b1a5d171a9",
                "label": "Taxonomy",
                "name": "taxonomy",
                "type": "taxonomy",
                "instructions": "",
                "required": 0,
                "conditional_logic": 0,
                "wrapper": {
                    "width": "",
                    "class": "",
                    "id": ""
                },
                "taxonomy": "post_tag",
                "field_type": "multi_select",
                "allow_null": 1,
                "add_term": 1,
                "save_terms": 1,
                "load_terms": 1,
                "return_format": "id",
                "multiple": 0
            }
        ],
        "location": [
            [
                {
                    "param": "page",
                    "operator": "==",
                    "value": "6"
                }
            ]
        ],
        "menu_order": 0,
        "position": "normal",
        "style": "default",
        "label_placement": "top",
        "instruction_placement": "label",
        "hide_on_screen": "",
        "active": true,
        "description": "",
        "show_in_rest": 0
    }
]

Reproduce the issue with the exported field group: a required text input plus a taxonomy field with add_term enabled on a frontend form. Inspect the frontend taxonomy term-creation request and form submission behavior; done means adding a taxonomy term does not submit the whole form or trigger required-field validation.