While fixing aspect (2) of tdf#130945 I stumbled upon the following error:

A prepared OLE might be opened by two running instances of LO at the same time. In this scenario (besides also (2) creates irritation here) it is non-deterministic who's change gets applied. This depends on which instance of LO deactivates the shared OLE first (or with (2) fixed, who saves the hosting document first).
A fix of this would need to evtl. check when inserting the shared linked OLE if it is opened already by another instance, or - alternatively - check on save/deactivate and evtl. ask user if he wants to discard or copy the OLE - something like that, details need discussion.

Also refer to aspect (3) https://bugs.documentfoundation.org/show_bug.cgi?id=130945#c4