Why do many Windows games fail when the network is sandboxed?

I run Windows games with Wine, and use bwrap to sandbox them. I've noticed that passing --unshare-net to disable the network breaks many, many games (they fail to start with no obvious error message). However, at the same time, if I do nmcli networking off instead of --unshare-net the game launches fine.

Why would --unshare-net crash a Windows program on launch, and how can I block internet access from inside bwrap?

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Why do many Windows games fail when the network is sandboxed?

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