[NTG-context] emergency stretch not taken in account in some cases

Dear all, In some cases specifying \setupalign[stretch] does not seem to have any effect with latest betas (live, 2016.06.20 22:14 version are fine, but 2016.07.18 is not), and the output has now overfulls instead of (admitedly a bit large) underfulls. Attached simple (albeit bit extreme) MWE. Sorry for the relatively large MWE but could not figure out how to make it shorter. emergency_stretch.pdf produced with latest beta (updated with first-setup.bat today). emergency_stretch_ok.pdf produced with 2016.06.20 22:14 version. Thanks a lot for any advise. Best regards Joseph Canedo