[Закрытые] Posts are translated on the front-end, but editor shows fields with missing translations

Background of the issue:
I am trying to edit a complete translation using the translation editor (pencil icon).

Symptoms:
The translation editor shows empty fields or fields flagged for later with original texts, even though the front-end displays the translations correctly.

Questions:
Why does the translation editor show empty fields or original texts when the front-end displays translations correctly?
How can I ensure that the translation editor reflects the completed translations?