When driving over alien's building and red aliens in multiplayers (with tanks) sometimes, the one that crushes the entity sees it dies and the other one does not. It leads to a desync, not looped though.
It never happened when small (ranged or not) aliens were crushed.

Here is the part of the log ...

On multiplayer game with the language parameter set to French, the game crashes when any research ends. This does not happen when the game is in english.

See the screenshot of the error message here