Using a custom helper in a escaped string, and escaping a string argument to that helper is not handled correctly by Handlebars.Net

[StefH]

Describe the bug

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Expected behavior:

A clear and concise description of what you expected to happen.

Working unit-test

[Fact]
 public void SelectToken_WithComplexTemplate()
 {
 // Arrange
 const string requestAsJson = """
 {
 "bodyAsJson": {
 "pricingContext": {
 "market": "US"
 }
 }
 }
 """;
 var request = JsonConvert.DeserializeObject(requestAsJson);

 // Use single quotes for the JsonPath else it will be parsed correctly by Handlebars.Net
 var action = _handlebarsContext.Compile("{\r\n \"market\": \"{{JsonPath.SelectToken bodyAsJson '$.pricingContext.market'}}\",\r\n \"languages\": \"en\"\r\n}");

 // Act
 var result = action(request);

 // Assert
 var expected = """
 {
 "market": "US",
 "languages": "en"
 }
 """;
 result.Should().Be(expected);
 }

Using escaped double quotes does not work:

"{\r\n \"market\": \"{{JsonPath.SelectToken bodyAsJson \\\"$.pricingContext.market'}}\\\",\r\n \"languages\": \"en\"\r\n}"

Exception:
System.NullReferenceException : Object reference not set to an instance of an object.

Linked to
wiremock/WireMock.Net#1108