Steps to reproduce the issue

1. Create form with subform field and have an editor field.
2. Change default editor to CodeMirror.
3. Drag the entry around.

Expected result

Editor should not duplicate itself.

Actual result

Editor duplicates itself.

System information (as much as possible)

PHP Version | 8.0.28
nginx/1.23.1
Joomla! 4.3.1 Stable [ Bora ] 2-May-2023 16:00 GMT
Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:109.0) Gecko/20100101 Firefox/113.0

Additional comments

It works fine with any other editor but CodeMirror.

Example form:

<field
    name="pages"
    type="subform"
    label="Pages"
    multiple="true"
    layout="joomla.form.field.subform.repeatable"
    >
    <form>
        <field
            name="title"
            type="text"
            label="Title"
        />
        <field
            name="content"
            type="editor"
            label="Content"
            filter="JComponentHelper::filterText"
            buttons="false"
        />
    </form>
</field>