Nexus 5x encryption without passcode/pattern at boot?

Hey,

I've got a N5X with a pattern for security. I don't want to use the fingerprint reader. The phone's about two weeks old. When I got it, it asked me the pattern at boot time, so it could encrypt and boot. Now when I boot, it doesn't ask but boots. According to the settings, its still encrypted, so whats going on? I believe I read something about a problem like this online before, but I can't find it anywhere, so maybe you could help.