I search for "c# string replace performance".
I realize that the top results include SO answers from 2008, so I prepend my "limit results to the last 5 years bang" to the query.
What happens is that instead of running the same query i.e. "c# string replace performance" with a filter on Time from 2020-01-01, it runs a query on just the letter "c" without any kind of Time filter.
The bang is defined as shortcut = "5y" and url = "https://kagi.com/search?q=%s&from_date=2020-01-01"
So if I type in the search box "!5y c# string replace performance" it goes to "https://kagi.com/search?q=c#%20string%20replace%20performance&from_date=2020-01-01", but the input box on the results page only contains "c" and the results pertain to searching for "c".
I expect the results to be about "c# string replace performance" and limited to the past 5 years.
