The old Intel models were hit or miss, but with the M-series models I’ve never had problems with MacBooks not going to sleep when the lid is shut and staying th

The old Intel models were hit or miss, but with the M-series models I’ve never had problems with MacBooks not going to sleep when the lid is shut and staying that way so long as wake on LAN is disabled (or disabled on battery). That setting does need to be off though, with it on I did observe occasional misbehavior.