Content Section - No ID

Not a huge issue but when adding a content section from the toolbox, the ID shows as NaN rather than the ID of the selected content section.
{%- include 'content_section', id: 'NaN', name: 'App Section' -%}
This has only just started happening so not sure if it is part of an update.
Obviously NaN can be replaced with the ID of the content section to get the tag to work but just a bit of a faff to get the relevant ID when it previously worked perfectly.
Thanks :)