(1) start a new translation (do not publish)
(2) after the translation will be saved, click e.g. on 'All translation' and then load the started translation.
The Console will display the following warning and the translation never finish loading:
TypeError: Cannot read property 'content' of null at Object.mw.cx.dm.Translation.static.getSavedSection at Object.<anonymous> at Array.forEach at Object.mw.cx.dm.Translation.static.getSourceDom at new MwCxDmTranslation at MwCXInitTranslation
Note1: I do not think that lang is important - but I tried it with en-es