SP4: Share with other lang is no more persistent on big text field. Work correctly on small text

I have two lang. I open a main_content in one lang and entered a title (with share all lang activated). Same is true with the Content (with share all lang turned on). If you switch to another field and come to your big text again the share with other lang activation on the big texts is not restored (similar if you close the engine and re-update it).

This works fine with small texts