AOE2 DE on Linux: "out of sync" in multiplayer

Has anyone managed to get AOE2 DE running through the SteamPlay interface on Linux?

I am running Ubuntu 20.04, and I have now tried it with all versions of proton>=4.11 and I keep getting "out of sync" errors within a minute when playing multiplayer (apologies to everyone whose afternoon I ruined, btw, in case you see this).

I have also tried all the solutions I could find on the internet related to this, including this link, but they don't help fix the "out of sync" problem. I would like to avoid having to set up Wine separately, so if anyone has managed to get AOE2 DE up and running on Linux, I would really appreciate any suggestions.

Thanks!

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FWIW: my PC has enough specs to run the game. I was able to play offline just fine, the problem seems to happen only in online multiplayer.