This issue with the TM sorting has been addressed and will be included in the next release, which we aim to deploy towards the end of November. Apologies for the inconvenience.
I can confirm and found it is the same if you want to import - this makes it even more difficult when you e.g. have to import 40 different languages into a TM - I resorted to having a tick-off paper checklist next to me as with the unreliability off the order in the list otherwise would make me miss a language for import.
Support/development seemed to say this is not a bug and has never been alphabetical. I am glad I am not alone in remembering that the languages were sorted.