Hello,
Just to report a particularly strange omission :
When Setting up Custom Games, it is not possible to select the Busan sub-maps for gamemodes where all other Control maps are available (e.g. : Nepal SANCTUM or Oasis GARDENS), and it is not possible to play on the Busan MEKA BASE for instance.
I hope that you already had this issue in visibility.
Have a nice day 
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Sorry for the duplicates, but it has been 6 months now…
They are not going to fix anything, not even this bug:
I am pretty sure their intention is to fix the most aggravating bugs first.
In your case, it might prove to only happen to people with many presets, and only occasionally. It also does not prevent you from playing those game modes by reselecting everything.
However, in this bug/mistake’s case, there is no way around it, and it affects everyone playing half of the custom game modes. It shoudl also be quite easy to fix IMHO.
Thanks for your reply anyway.