The February Maintenance Update has landed! - Steam News

"Fixed a bug with the server list that caused Hazard 5 missions to always appear even when they should be locked, leading to new players accidentally joining Hazard 5 (lol)"

Made me giggle. I'm pretty sure I was victim to this bug, before I understood the iconography.

It was still fun. I thought I just had astoniahingly bad random generator luck. Which I guess, technically, I did.