[تم الحل] Translations disappear when you edit a translation

Background of the issue:
When editing an English version of a Danish page, some content disappears and changes to Danish. I have recorded a short video where I reproduce the problem: الرابط المخفي

Symptoms:
Translations disappear and change to Danish when editing an English version of a Danish page.

Questions:
Why does content disappear and change to Danish when editing an English version of a Danish page?
How can I prevent content from changing to Danish when editing translations?