doors - nes - dungeon ?

treat as nes, wouldnt that be related to how the first dungeon and its first locked door behaves?

Nnno, I'm 101% sure that "Treat as NES Dungeon" means to make secrets non-permanent, and to enable the doors. It has nothing to do with emulating that bug.

I worked around it by making the player push a block to open the doors.
But, yea, I still think it's a bug.

I'm having trouble reproducing this bug - when I insta-warp into the room, the Stalfos fall and the door remains closed until they're dead.
If you walk into the room instead of warping (using cheats), does the shutter close as expected?

The way it was set up, was that the first room was 4 stalfos 2's that didn't fall from the ceiling with shutters closing you in.
When you killed them, enemies=secrets would place direct warp tiles under links feet taking him to an identical room, and the sens. direct warp screen flag was used.
When he arrived at the second room 4 more stalfos then dropped from the ceiling.
When the door opened as you were leaving the first screen then it caused it to stay open in the second screen.
I wasn't using full screen warp.

I redesigned the screen as noted above, so I've never tried this again since back in that beta.

Ok, since I'm not able to reproduce the bug, I'll reclassify it as unverified. Let me know if it shows up again.

There's a good chance that this will give someone trouble when they try to make a custom boss, otherwise it can be worked around.
If you hear about it again, that will probably be the situation.

Can you give us a test quest that exhibits this problem?

http://members.toast.net/mfreedom/bug/door_test.zip

Grab the sword walk up one screen kill the baddies.
Doors open.....
It insta warps you to an identical screen where four more baddies drop from the ceiling BUT the doors don't remain closed as they should until the new baddies are snuffed. 😉

Sure enough. Fixed in the next build.