This is indeed a bug, though unrelated to snippets.
If the 'Editable' property of a list view is set to 'Yes', after which it is placed inside a non-editable data view, is does not respect the non-editable context. You can work around this by explicitly setting the 'Editable' property to 'No'. (You will have make the surrounding data view editable first to be able to change this property.)
This issue will be fixed in version 6.5.0.
I have checked the model and this is a bug in my opinion. File a support ticket on https://support.mendixcloud.com and attach the same model to the ticket. Mention also this forum post and the steps on how to reproduce it (in this case very simpel).
Regards,
Ronald