In Policy editor, create a policy and add two conditions of the same type with a logical operator (either OR or AND, neither work).
For example take a simpleTime condition. Access allowed on (Monday to Tuesday) OR on (Thursday to Friday).
You can see both conditions in the editor when you create them.
When you save the policy however, it removes the second condition and when you open the policy again it is not in the editor.
Checking in the Configuration store shows that it is not saved there properly either.