Recursion problem with embedded Webform

Problem/Motivation

Can't submit Webform entities embedded into modal.

Steps to reproduce

Add Webform entity reference field to modal. Embed a webform. View modal and fill out webform. Submit...nothing happens. View Console.

Uncaught InternalError: too much recursion
    be https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.24.0/moment.min.js:1
    Te https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.24.0/moment.min.js:1
    i https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.24.0/moment.min.js:1
    t[0] https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.24.0/moment.min.js:1
    A/V[t]< https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.24.0/moment.min.js:1
    A https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.24.0/moment.min.js:1
    format https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.24.0/moment.min.js:1
    setModalCookie http://powertodecide.localhost/modules/contrib/ik_modals/js/modals.js?r97e3t:357
    handleModalInternals http://powertodecide.localhost/modules/contrib/ik_modals/js/modals.js?r97e3t:401
    jQuery 2
moment.min.js:1:7171

Proposed resolution

Patch attached.

Remaining tasks

Review and consider other solutions.