Timezones in Lookout for Metrics

Hello,

I am configuring a new Lookout for Metrics datasource via the AWS Console. The list of timezones (image below) seems completely arbitrary and does not include the full list of worldwide timezones (for example, Europe only lists Europe/Amsterdam, and UTC is missing entirely). Is this a bug in the console, or does the list represent the list of timezones that Lookout for Metrics supports?

For clarity, I also tried manually typing the timezones I was searching for in the provided dropdown search box, and the list of timezones shown in this screenshot is indeed exhaustive. No other timezones are available for selection, even if manually typed.