Steps to reproduce:

1. Create a new CT with a single Text line field (not required), call it "Title".
2. Create a Content of newly created CT in two languages (make original title field `null`, in translated version make it a normal string).
3. Edit the mentioned CT and edit the "Title" field to be required.
4. Edit second (non-empty) translation, change the value to any string value, click on publish.
5. Put a dump($errors); before the line with the error to observe the validation errors.

Result:
Dumped data shows 3 validations errors.

Expected result:
Dumped data shows 1 validation error.