Slicksters can no longer walk onto pneumatic doors, horizontal or vertical.
They were able to do so a few patches back on qol3. Other critters still can walk on pneumatics.
(Hatchling on pneumatic)
(Slicksters unable to go onto pneumatics)
Steps to Reproduce
Put Slickster next to pneumatic door
This issue has been fixed in either a future version or updated in a previous version.