The Auto-Wrangle surplus feature should not count creatures in a room that are already wrangled. If the wrangled creature cannot be put into a new home, the ranger will continue to wrangle creatures until they are all wrangled.
Alternatively, the ranger should not wrangle excess creatures if he can't deliver them elsewhere. In such a case a "Overcrowded" notification would be nice.
Steps to Reproduce
Create a ranch room with Critter Drop-Off, put 9 Hatches in the room, but set the Drop-Off to auto wrangle limit at 8. Have no other Ranch accept Hatches. Watch.
This issue has been fixed in either a future version or updated in a previous version.