'Configure pgagent to execute every 30 minutes in postgresql

I have a pgagent in postgresql that I want it to execute every 30 minutes. But instead it executes at the 30th minute of every one hour. For example is executes every 1:30, 2:30, 3:30 and so on instead of executing at 1:30, 2:00, 2:30 etc.

My schedule:

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