Recurring ICS events do not shift with timezone

[IrisLiu-00]

Reduced Test Case

https://codepen.io/IrisLiu-00/pen/XWZEwVv?editors=0010
You will need to circumvent a CORS error on the ICS link by clicking "Request Access" here: https://cors-anywhere.herokuapp.com/corsdemo

Bug Description

Recurring events from an iCalendar do not get adjusted with timezones, while singular events do. I would expect both recurring and singular events to be shifted with timezones.

Screenshots

[acerix]

I believe this existing ticket captures this need:
#5273
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