Steps to reproduce:

1. Create a translatable page with at least one section
2. Mark it for translation
3. Translate a unit to some language
4. Make change to the translatable page with that section you translated
5. Mark the page for translation, do not check "skip fuzzy" checkbox
6. Update the now fuzzy translation to "something else"
7. Now mark the updated translation with !!FUZZY!! and save

Observed: the translation page still contains "something else". By normal rules it should contain the source text.

I didn't have time to check, but steps 4-6 could possibly be skipped with the same result.