I changed the config file for my standard multiplayer survival server along time ago to include ramps for a custom CV I built and for whatever reason after the latest update, there's a very small section at the end of these 1x4x2 ramps that isn't airtight. I've tried replacing them, but no go. Not sure why this portion isn't airtight but the rest and the other ramps are? The ship design makes it almost impossible to setup a forcefield since oxygen can escape half-blocks now, lol. edit: not sure why the pictures I attached were never added. let's try again..
Alright, I don't know how on earth I overlooked or missed this, but ramps all have airtight options now. For whatever reason, I only saw them for the SV ramps when I was first troubleshooting this issue, but CV didn't give me that option. A few days / a week later, suddenly the airtight options were there for CV ramps. Like I said, really weird, but the issue is fixed now. @fonel You should have O2 airtight options for ramps as well.