[تم الحل] Translation stuck at 99% and not showing what's missing

Background of the issue:
I am trying to translate a page using WPML. I'm at 99%, and it states that there is one segment that is not translated. But I can't find it.

Symptoms:
Translation stuck at 99% and not showing what's missing.

Questions:
Why is my translation stuck at 99%?
How can I find the missing segment that needs translation?