Why is string.startswith(char) method not found.

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C#

When trying to compile the following two code lines the compiler is complaining with error "CS1503 Argument1: cannot convert from 'char' to 'string'".

string test = "abcd";
bool result = test.StartsWith('a');

When I pass the letter 'a' as a string the method works as expected.
The MS documentation tells me that there exists an overload which takes a char as a single argument.
String.StartsWith Method (System) | Microsoft Docs[^]

Why does the compiler not find this method?

What I have tried:

I also tried:

string test = "abcd";
char ch = 'a';
bool result = test.StartsWith(ch);

which produced the same compiler error.