(1) start a new translation (do not publish)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 MwCXInitTranslationNote1: I do not think that lang is important - but I tried it with en-es