As a manager, I will quite literally ding people for working when they are supposed to be off.
Work during work time, don't work during not-work time. Good practices mean that everyone is important, but nobody is irreplaceable, the team and the work will move along a little slower, but that's fine.
extremely relevant recent Kai Lentit skit:
Being the only dev in a startup since 2 years without a single day off where I wasn't messaged by my employer I want this. At least I'll have a 3 week out of country trip where I do not bring my laptop later this year...
You're a good person.
My manager doesn't stop overworking. When told on peer performance review that we have people who are consistently overwork because they are swamped, he played it down.
But hey, at least he doesn't encourage overworking either.
Quote from my partner's manager before a vacation:
"If I see you log on, I'll disable your account."