If I edit an existing translation of a string in AMOS (versions set to default 'Latest available version'), the change is propagated to versions DEV, 3.6 and 3.5, but not to version 3.7.
Translating previously untranslated strings works as expected. The translation is propagated to all versions, including 3.7.
I've opened an issue on Moodle Tracker: https://tracker.moodle.org/browse/MDLSITE-5899