I've had multiple game crashes recently (since some patch probably not sure which). In the game which is in the accompanying log apparently multiple people crashed at the same time. It happened when an ACU was exploding.
Not 100% sure it will solve the crashing(haven't been able to force it to crash) but at least the log won't be spammed with "Invalid entity-id in pose update" messages.
I told Sheeo some weeks ago we had similar crashes in Nomads due to wrecks intereaction when nukes and ACU exploded (because wrecks are sucked up in a blackhole), but I don't know if he investigated this. If the crashes happen when ACU die, it means there is an issue when lot of units are turned into wrecks at once. Would affect nuke explosions too.
I investigated a bit, and I can't crash the game with ACU and nuke explosion. But I think the code modification done to wrecks is something to investigate. Now that I remember what caused our crashes in Nomads, it was air units wrecks interaction, or something like that, I don't know the full details.