What you see is expected, I’ll try to explain!
There absolutely can be approaches that do not have dedicated, public charts. These approaches can still be shown on the map and flown, unfortunately without the help of a chart.
In some cases, special charts are issued in a non-standard way - for a particular airline only for example.
In this particular case, there are special charts that are not part of the data that we get from Jeppesen. Unfortunately, there are no plans to add these at the moment, see this thread:
I hope this clarifies the situation a bit!
Kind Regards,
Malte