Originally Posted by paulpeer
I tried to add soft hyphens to a text. This works perfectly. But when I save the text, and open it again with Sigil, all the hyphens are gone ...
Define what you mean by "soft hyphens". There's more than one way to add them.
Create an issue on the tracker along with the step-by-step procedure that replicates this problem. Attach an epub file if necessary.