Hatchlings Float Over Doors

This holds true with both airlocks and the pneumatic door, and affects a number of creatures.  I have tested this by spawning them in with sandbox—notably, they take a few seconds to unfreeze and obey gravity when spawned in this way—and having a duplicant open the door, which comprises the only 2 blocks they could stand on.  All creatures continue to pace back and forth without falling pretty much ever, suggesting that so far as they are concerned, it's still a completely valid floor.

Additionally:

A flopping Pacu will not obey gravity immediately upon jumping over a hole, and debug teleporting one out of water will take a few moments—even while the game is paused—to realize that it should be flopping.  Teleporting one back into water may take a moment too, and the Pacu doesn't seem to be able to figure out it's in water while the game is paused.  I don't know if this is related or not.

The Drecko considers the doors to be open and solid at the same time, as it can crawl onto the inner sides of each tile the door covers.  (I don't know how to describe it—just see the screenshot.)

The Slickster actually falls through the opened door pretty quickly.  So far, this is the only one that I have tested that does so.

When I destroy the door, the creatures keep floating for some time, but they stop pacing.  They float for about as long as it takes the Pacu to finally fall down a hole while flopping.

(Some images have the game paused, but in all cases, the critters were floating before I did that out of habit.)

The slickster is just starting to fall in the screenshot below:

The Drecko, however, has no such plans:

It took more than 10 seconds for them to fall down after deconstructing the door, but probably less than 30.  (I didn't exactly count.)

This is about the same amount of time that it takes one of my Pacus to vertically navigate with the power of gravity:

Edited May 1, 2018 by Zippy95

I can confirm this is still happening in the launch update.