Some lessons missing from timetable Oman export

[KoZsombat]

[nemvince]

@busyLambda please take a look

[busyLambda]

@nemvince

I'll look into it

[busyLambda]

The subject and seemingly the class itself are missing from the export file we have as of now.

We will experiment with other exports to see where the issue could be.

@nemvince we also need to inquire about the way in which the timetables are created, as discussed.