Setting schedule to publish for multiple translations in single Content results in only the last translation being published.
Also, rest of changes made in translations for that content are dropped.

Steps to reproduce:
1. Create a new translation,
2. Create new Content,
3. Add new translation for this Content,
4. Edit Content, selecting the first translation
5. Make changes and set scheduled publish,
6. Do the same when editing second translation, but set later publish time (eg. 5 minutes later),
7. Go to admin/dashboard and look at "My Scheduled". As you can see there are two on that list.
8. Open console and run:

php bin/console ezstudio:scheduled:publish

Results
Only last of scheduled tasks was published (with three translations it works same)

Expected:
All of the scheduled tasks were applied.