So you developed your app and neglected your config.xml?
If you are as impatient as me then your app might still showing up as
HelloCordova on your devices/emulators.
Updating your config is apparently not enough because your platform builds still contain references to the old app meta data.
This might be really basic but I found myself stumbling over this all the time. Writing it down may help.
Retrieve an array with all (published) post IDs for (queryable) post types having a custom field
my_meta_field with a value (string).