Symptoms
All expressions and rules which contain Environment Fields from the category "Miscellaneous Field" will be unresolved after deploying on the destination K2 server. Then I have to use the Designer on the destination server to correct the issues manually.
Diagnoses
It seems like the fields were missing in the PandD package.
Resolution
After adding the Environment Fields to the PandD package, they are available on deployment. However, this is changed functionality since 4.6.9 and was working without doing this in 4.6.8.