The media form field type inside subform is not using my default media manager (JCE)

Steps to reproduce the issue

This is just for comparison, the first field does not exist.
<fieldset name="basic"> <field name="myimage" type="media" preview="tooltip" directory="" label="My image" description="" /> <field name="subform" type="subform" formsource="path/to/file/item.xml" min="1" max="10" multiple="true" layout="joomla.form.field.subform.repeatable" groupByFieldset="true" label="Subform" description="Subform Field Description" /> </fieldset>

And item.xml:
<fieldset name="image"> <field name="myimage" type="media" preview="tooltip" directory="" label="My image" description="" /> </fieldset>

Expected result

Both fields must use the same media manager, JCE in this case.

Actual result

The field outside subform is using jce media manager and the other uses the joomla default media manager

System information (as much as possible)

Windows 10
localhost
apache 2.4.23
php 7.0.18
mysql 5.7.14
Joomla 3.6.5

Additional comments

This was also tested with Joomla 3.7.0, with the same results.