in the room overlay the tooltip for stable says the requirements are:
* grooming station
* min size 12 max size 96
but if you make a stable and put a sick bay in the stable room it will not count as a stable and the tooltip for the room will say to remove the conflicting buildings. However no where in game does it say that a sick bay conflicts with the stable requirements.
the stable requirements should have something added like "no medical machinery" like the no "industrial machinery" that is stated for other rooms. or at least something to clarify that medical buildings cannot be placed in a stable.
Steps to Reproduce
build a stable see that it is a stable in the room overlay put a sick bay in the stable see that it is no longer a stable in the room overlay
This issue has not been confirmed by a developer yet.