[Закрытые] A language disappeared

Background of the issue:
I was trying to manage languages on my WordPress site using WPML. One of our languages, EN_IE, disappeared from the language array. We re-added it, which made it reappear in the language array and restored the domain mapping to the TTCLD. However, now all the content/pages are missing. The issue can be seen at скрытая ссылка. I expected to see a similar page to roomraccoon.co.uk.

Symptoms:
The EN_IE language disappeared from the language array, and after re-adding it, all the content/pages are missing.

Questions:
Why did the EN_IE language disappear from the language array?
How can we get the missing content/pages back after re-adding the language?